In 2016, the CDC estimated the mean weight of U.S. women over the age of 20 years old was 168.5 pounds with a standard deviation of 68 pounds.

What is the expected mean for a sample of 150 women?
What is the standard deviation of the mean for a sample of 150 women?
What is the probability of 150 women having a sample mean below 160 pounds?
What is the probability of 150 women having a sample mean above 175 pounds?
What is the probability of 200 women having a sample mean below 160 pounds? Notice the change in sample size.
What is the probability of 200 women having a sample mean above 175 pounds?

The probability that a randomly selected bottle is correctly placed AND is a Plastic #4 bottle is 0.25 or 25%

What is Conditional probability?

Conditional probability is the probability of an event occurring given that another event has occurred or is known to have occurred. It is denoted by P(A|B), which reads as "the probability of A given B."

The formula for conditional probability is:

P(A|B) = P(A and B) / P(B)

where P(A and B) is the probability of both events A and B occurring, and P(B) is the probability of event B occurring.

The total number of Plastic #2 bottles is 8 (correctly placed) + 5 (incorrectly placed) = 13.

The total number of Plastic #4 bottles is 5 (correctly placed) + 2 (incorrectly placed) = 7.

The probability that a randomly selected bottle is correctly placed AND is a Plastic #4 bottle is given by:

(number of Plastic #4 bottles correctly placed) / (total number of bottles)

So the probability is:

5/20 = 1/4 = 0.25

Therefore, the probability that a randomly selected bottle is correctly placed AND is a Plastic #4 bottle is 0.25 or 25%.

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Answer:

55 degrees angles on a rights angle triangle. 1 and 3 they are equal cause they are vertical opp angles 55 degrees

Answer: D

Step-by-step explanation:

i think so

Consider a disk D having center as origin and radius 'a', the average distance from point say ( r, θ) to the origin D to the origin is equals to the 2a/3.

The distance of a point to the origin is given by the function d(x, y) = √x²+ y². Denote the disk by D. To compute the average we need to evaluate the integral, for which we use polar coordinates, f(r, θ) = (1/area of region R)∬ f(r,θ)dA.

We have a disk D with center the origin (0,0) and radius 'a'. We have to determine the average distance from points in D to the origin. Since r is defined as the distance from the origin, the distance of any point (r,θ) from the origin is f(r,θ) = r

Integrating f over the region D, with limits r = 0 to a, and 0≤ θ≤2π , dA = r×dr×dθ

[tex]∬f(r,θ)dA = \int_{0}^{a} \int_{0}^{2π} r (rdr)dθ [/tex]

[tex]= \int_{0}^{2\pi} \int_{0}^{a} r^{2} drdθ = \int_{0}^{2\pi}[\frac{{r}^{3}}{3}]_{0}^{a}dθ[/tex]

[tex]= \int_{0}^{2π}[ \frac{a³}{3} ] dθ = \frac{{a}^{3}}{3} \int_{0}^{2π}dθ[/tex]

[tex]= \frac{a³}{3} [θ]_{0}^{2π} = 2\pi(\frac{a³}{3})[/tex]

Area of disk D with radius 'a' = πa²

So, the average distance from point ( r,θ) in D to the origin is = (1/area of region D)∬f(r,θ)dA

= (1/πa²)( 2πa³/3)

= 2a/3

Hence, required distance is 2a/3.

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Step-by-step explanation:

4 i guess... sry i m not good at maths

Answer:  Participant A

Step-by-step explanation:

if you divide 120 by 10 you would get 12 jumping jacks per minute and if you divide 140 by 14 you would get 10 jumping jacks per minute

Answer: 1.85

Step-by-step explanation:

When conducting course-based human research, Informing participants about what will happen to the data gathered is an essential aspect of ethical research practice and can contribute to the overall quality and credibility of the research. This includes explaining how the data will be collected, stored, and analyzed, as well as how it will be used and potentially shared with others.

By informing participants about the use of their data, researchers can build trust and transparency with their participants. Participants have the right to know how their data will be used and to provide informed consent to participate in the study. This also allows participants to make an informed decision about whether or not they want to participate in the study.

Furthermore, informing participants about the use of their data can help ensure that ethical guidelines are followed and that the study is conducted in a responsible and respectful manner. This can help to prevent any potential harm to participants and can contribute to the overall validity and reliability of the study.

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Answer:

Step-by-step explanation:

Sure! Here's a number line showing the distance of 0.75 kilometers:

0 -------------|-------------|------------- 0.75 km

The "0" on the left represents the starting point (such as home), and the "|---|" in the middle represents the distance of 0.75 kilometers to the destination (such as school).

Answer:4/5 are adults. There are 72 adult dogs.

Step-by-step explanation:

Answer:

1 1/2 or 3/2

Step-by-step explanation:

Cutting the recipe in half means multiplying each measurement by 1/2.

3 x 1/2 = 3/2 or 1 1/2

The equation of the circle with center at (-11, 15) and radius 9 is found to be x² + y² + 22x -30y + 337 = 0.

The center of the circle is located at the point (-11, 15). The radius of the circle is given to be 9.

Now, using the standard equation of the circle that has point (a, b) as center and r as the radius, we can write,

(x-a)² + (y-b)² = r²

Now, putting all the values,

(x-(-11))² + (y-15)² = (3)²

Solving further,

x² + 121 + 22x + y² + 225 - 30y = 9

x² + y² + 22x -30y + 337 = 0

So, the equation of the circle is found to be x² + y² + 22x -30y + 337 = 0.

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Answer:

------------------------

As per given coordinates we can observe that the diagonals of the rhombus are horizontal and vertical.

The length of the diagonal is the difference of x-coordinates for the horizontal diagonal and the difference of y-coordinates for the vertical one.

The diagonals have the length:

The area of a rhombus is half the product of the diagonals, therefore the area of the given rhombus is:

The area οf the given rhοmbus is 22.5 square units. Tο find the area οf the rhοmbus, we need tο first find the length οf its diagοnals.

A rhοmbus is a type οf quadrilateral that has fοur sides οf equal length. It is alsο knοwn as a diamοnd οr a lοzenge. In additiοn tο having equal sides, a rhοmbus alsο has οppοsite angles that are cοngruent (have the same measure). It is a special case οf a parallelοgram, as its οppοsite sides are parallel.

Tο find the area οf the rhοmbus, we need tο first find the length οf its diagοnals. We can dο this using the distance fοrmula:

[tex]\rm d_1 = \sqrt{((4 - (-2))^2 + (-4 - (-1))^2)} = \sqrt{(6^2 + (-3)^2)} = \sqrt{(45)[/tex]

[tex]\rm d_2 = \sqrt{((-8 - (-2))^2 + (-4 - (-7))^2)} = \sqrt{((-6)^2 + 3^2)} = \sqrt{(45)[/tex]

Now that we have the lengths of the diagonals, we can use the formula for the area of a rhombus:

Area = [tex]\rm (d_1 \times d_2) / 2 =\dfrac{ (\sqrt{(45)} \times \sqrt{(45)}}{2}[/tex]

= (45/2) square units

Therefore, the area of the given rhombus is 22.5 square units.

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a) The mean is 720 and the standard deviation for the distribution is approximately 28.87

b. The probability that X is less than 710 is 33%

a. To calculate the mean and standard deviation, we use the following formulas:

Mean (μ) = (lower limit + upper limit) / 2

Standard deviation (σ) = (upper limit - lower limit) / √12

Substituting the values, we get:

Mean (μ) = (670 + 770) / 2 = 720

Standard deviation (σ) = (770 - 670) / √12 ≈ 28.87

b. To find the probability that X is less than 710, we use the following formula:

Probability (X < 710) = (710 - lower limit) / (upper limit - lower limit)

Substituting the values, we get:

Probability (X < 710) = (710 - 670) / (770 - 670) ≈ 0.33

This means that there is a 33% chance that X will be less than 710.

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The graph of the linear function 4x + 6y = -12 is given by the image presented at the end of the answer.

The slope-intercept representation of a linear function is given by the equation presented as follows:

y = mx + b

The coefficients of the function and their meaning are described as follows:

The function for this problem is given as follows:

4x + 6y = -12.

In slope-intercept form, the function is given as follows:

6y = -4x - 12.

y = -2x/3 - 2.

The slope and the intercept are given as follows:

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Step-by-step explanation:

a probability is always the ratio

desired cases / totally possible cases

we have 2 possible cases for the coin and 6 possible cases for the die.

so, we have 2×6 = 12 combined possible cases :

heads, 1

heads, 2

heads, 3

heads, 4

heads, 5

heads, 6

tails, 1

tails, 2

tails, 3

tails, 4

tails, 5

tails, 6

out of these 12 cases, which ones (how many) are desired ?

all first 6 plus (tails, 3) = 7 cases

so, the correct probability is

7/12

formally that is calculated :

1/2 × 6/6 + 1/2 × 1/6 = 6/12 + 1/12 = 7/12

the probability to get heads combined with the probability to roll anything on the die, plus the probability to get tails combined with the probability to roll 3.

After 30 seconds the bugs will be apart by (x -y) = 30 units

The speed of an object, aIso known as "v" in everyday speech and kinematics, is a scaIar quantity that measures how much its position changes over time or how much it changes per unit of time.

The distance traveIIed by an object during a time intervaI is equaI to the duration of the intervaI divided by the object's speed, with the instantaneous speed being the upper Iimit of the average speed as the intervaI's duration gets cIoser to zero. VeIocity differs from speed. Distance divided by time is the formuIa for measuring speed. A metre per second (m/s) is the metric unit of speed.

a) The speed of F is 12 units in 4 seconds, or 3 units per second.

x = 3t

The speed of S is 8 units in 4 seconds, or 2 units per second.

y = 2t

b) x-y = 3t -2t = t

After 30 seconds the bugs will be apart by (x -y) = 30 units

c) x - y = 100 = t

The bugs will be 100 units apart after 100 seconds.

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The distance between bug f and bug s after 30 seconds is: distance = 90 - 60 = 30 units.

what is algebra?

Algebra is a branch of mathematics that deals with mathematical operations and symbols used to represent numbers and quantities in equations and formulas. It involves the study of variables, expressions, equations, and functions.

When bug s and bug f leave point 0, they are initially at the same location, which is at position 0 on the number line. After four seconds, bug s has traveled a distance of 4v_s units from point 0, and bug f has traveled a distance of 4v_f units from point 0. We know that bug f has traveled 12 units in this time, so:

4v_f = 12

Solving for v_f, we get:

v_f = 3 units per second

Similarly, we know that bug s has traveled a distance of 8 units in four seconds, so:

4v_s = 8

Solving for v_s, we get:

v_s = 2 units per second

Now we can find out how far apart the bugs are after 30 seconds. Bug f has traveled a distance of 30v_f units from point 0, which is:

30v_f = 30 x 3 = 90 units

Similarly, bug s has traveled a distance of 30v_s units from point 0, which is:

30v_s = 30 x 2 = 60 units

Therefore, the distance between bug f and bug s after 30 seconds is:

distance = 90 - 60 = 30 units.

So the bugs are 30 units apart after 30 seconds.

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The rate of change of cost C with respect to the percent of particulate pollution that escapes when p = 5 (percent) is -190000.

We know that the cost C, in dollars, of processing the exhaust gases at an industrial site to ensure that only p percent of the particulate pollution escapes is given by the equation C(p) = 7000(100− p) p

we have to find the rate of change of cost C with respect to the percent of particulate pollution that escapes when p = 5 (percent)

a) c (p) = 7600 (100-p) / p

c (p) = 7600 [p(-1) - (100-p) (1)] / 2p

= 7600/2p = 760000/4

= -190000

therefore, the rate of change of cost C with respect to the percent of particulate pollution that escapes when p = 5 (percent) is -190000.

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Answer: 1/12

Step-by-step explanation:

The value of the expression 2.1 × 1.6 = 3.36.

Decimals are a collection of numbers falling between integers on a number line. They are only an additional mathematical representation of fractions. Decimals allow us to express quantifiable quantities like length, weight, distance, money, etc. with more accuracy. Integers, also known as whole numbers, are represented to the left of the decimal point, while decimal fractions are shown to the right of the decimal point.

Given that the expression is: 2.1 × 1.6.

2.1 × 1.6 can be written as:

2.1 × 1.6 = 21/10 × 16/10

Multiply the numerator and denominator:

21/10 × 16/10 = 336/100

Covert the fraction into decimal:

336/100 = 3.36

Hence, the value of the expression 2.1 × 1.6 = 3.36.

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The answer of the given question based on the compound interest to find  total amount Nicole ended up paying for the machinery and the interest did Nicole pay on the loan is (A) the total amount Nicole ended up paying for the machinery is $14,342.52. (B) Nicole paid $2,342.52 in interest on the loan.

Compound interest is type of interest that is calculated not only on initial principal amount but also on accumulated interest from previous periods. In other words,  interest earned in each period is added to  principal amount, and  interest for the next period is calculated on  new, larger principal amount.

Compound interest can be thought of as "interest on interest" and is used in many financial transactions, like loans, investments, and savings accounts.

(a) The total amount Nicole ended up paying for the machinery is the sum of her down payment and all of her monthly loan payments over the 3-year period. We can calculate this as follows:

Total amount paid = Down payment + (Monthly payment x Number of payments)

Total amount paid = 1200 + (365.07 x 36)

Total amount paid = 1200 + 13142.52

Total amount paid = $14,342.52

Therefore, the total amount Nicole ended up paying for the machinery is $14,342.52.

(b) To calculate how much interest Nicole paid on the loan, we first need to calculate the total amount of the loan. We can do this by subtracting her down payment from the total cost of the machinery:

Total loan amount = Total cost of machinery - Down payment

Total loan amount = $13,200 - $1,200

Total loan amount = $12,000

Next, we can calculate the total amount of interest paid over the 3-year period by subtracting the total loan amount from the total amount paid:

Total interest paid = Total amount paid - Total loan amount

Total interest paid = $14,342.52 - $12,000

Total interest paid = $2,342.52

Therefore, Nicole paid $2,342.52 in interest on the loan.

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The composition f(g(x)) will not be a function of real values if g(x) is not a real number or f(g(x)) is not defined. Thus, the answer is f(x) = sqrt(2,9)(x) = -22. The correct option is A).

The composition f(g(x)) will not be a function of real values if there exists a value of x such that g(x) is not a real number or f(g(x)) is not defined for the output of g(x).

f(x) = sqrt(2,9)(x) = -22

This function is not well-defined because the square root of a negative number is not a real number. Therefore, the composition f(g(x)) is not a function of real values.

f(x) = -22, g(x) = sqrt(π)

g(x) is not a real number because the square root of pi is not a rational number. Therefore, the composition f(g(x)) is not a function of real values.

f(x) = x², g(x) = -22

The composition f(g(x)) = (-22)² = 484 is a real number. Therefore, the composition is a function of real values.

f(x) = ln(x), g(x) = -22

The input of f(x) must be positive because the natural logarithm of a non-positive number is not a real number. Since g(x) is a constant value of -22, the composition f(g(x)) = ln(-22) is not a real number. Therefore, the composition is not a function of real values.

f(x) = -22, g(x) = x²

The composition f(g(x)) = -22 is a real number. Therefore, the composition is a function of real values.

f(x) = -22, g(x) = ln(2)

The composition f(g(x)) = -22 is a real number. Therefore, the composition is a function of real values.

Therefore, the answer option is (A) f(x) = sqrt(2,9)(x) = -22.

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_____The given question is incomplete, the complete question is given below:

Which of the following functions will result in the composition f(g(x)) not being a function of real values? A. f(x) = V2,9(x) = -22 B. f(x) = -22, g(x) = VƏ c. f(x) = x², 9(x) = -22 D. f(x) = ln(x), g(x) = -22 E. f(x) = -22, g(x) = x2 F. f(x) = -22, g(x) = ln(2) G. None of the above.

Answer:

7 miles

Step-by-step explanation:

Note there are 63,360 inches in a mile.

So, rewrite scale as 1 inch: 1 mile, where inch replaces the unit.

Therefore 7 inches: 7 miles.

The triangle's other leg, side B, measures 12 cm in length.

When one of the interior angles is 90 degrees, or a right angle, the triangle is said to be a right triangle. The three internal angles of a triangle add up to 180 degrees in a right triangle because one angle must always be 90 degrees and the other two must always total to 90 degrees (they are complementary).

We can observe that the given triangle is a right triangle because angle A's measure is 90 degrees. The hypotenuse, which is represented by the letter "c," is the side that is opposite the right angle. The legs are the other two sides, and they are indicated by "a" and "b".

We are told that the hypotenuse (side c) is 13 cm long and that one leg (side a) is 5 cm long. The length of the other leg must be determined (side b).

The Pythagorean theorem, which asserts that in a right triangle, can be used.

a² + b² = c²

Inputting the values provided yields:

5² + b² = 13²

25 + b² = 169

b² = 144

b = 12

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Y1,Y2,Y3 denote a random sample from an exponential distribution with density funtion where θ(hat)1, θ(hat)2, θ(hat)3  and θ(hat)5 are unbiased. θ(hat)2 has the smallest variance among the unbiased estimators

To check for unbiasedness, we need to find the expected value of each estimator and see if it equals θ.

θ(hat)1 = Y1

E(θ(hat)1) = E(Y1) = θ

Thus, θ(hat)1 is an unbiased estimator.

θ(hat)2 = (Y1+Y2)/2

E(θ(hat)2) = E[(Y1+Y2)/2] = (1/2)[E(Y1) + E(Y2)] = θ

Thus, θ(hat)2 is an unbiased estimator.

θ(hat)3 = (Y1+2Y2)/3

E(θ(hat)3) = E[(Y1+2Y2)/3] = (1/3)[E(Y1) + 2E(Y2)] = θ

Thus, θ(hat)3 is an unbiased estimator.

θ(hat)4 = min(Y1,Y2,Y3)

For this estimator, we need to find the probability density function (pdf) of the minimum of the three random variables.

Let F_Y1_Y2_Y3 be the joint cumulative distribution function (cdf) of Y1,Y2,Y3, then the pdf of the minimum is given by:

f(θ(hat)4) = d/dy [F_Y1_Y2_Y3(y,y,y)] = 3(1/θ)e^-y/θf, y>0

E(θ(hat)4) = ∫0^∞ y(3/θ)e^-y/θ dy

= (3/θ) ∫0^∞ ye^-y/θ dy

Using integration by parts, we get:

= (3/θ) [θ + θ^2]

= 3θ + 3θ^2

Thus, θ(hat)4 is biased.

θ(hat)5 = Y (bar)

E(θ(hat)5) = E(Y (bar)) = E[(Y1+Y2+Y3)/3] = (1/3)[E(Y1) + E(Y2) + E(Y3)] = θ

Thus, θ(hat)5 is an unbiased estimator.

To compare the variances of the unbiased estimators, we need to compute their variances.

Var(θ(hat)1) = Var(Y1) = θ^2

Var(θ(hat)2) = Var[(Y1+Y2)/2] = (1/4)Var(Y1) + (1/4)Var(Y2) + (1/2)Cov(Y1,Y2)

Since Y1,Y2 are independent and identically distributed, Cov(Y1,Y2) = 0.

Thus, Var(θ(hat)2) = (1/4)θ^2 + (1/4)θ^2 = (1/2)θ^2

Var(θ(hat)3) = Var[(Y1+2Y2)/3] = (1/9)Var(Y1) + (4/9)Var(Y2) + (4/9)Cov(Y1,Y2)

Again, Cov(Y1,Y2) = 0, so Var(θ(hat)3) = (1/9)θ^2 + (4/9)θ^2 = (5/9)θ^2

Var(θ(hat)4) = Var(min(Y1,Y2,Y3))

Let X = min(Y1,Y2,Y3). Then,

F_X(x) = P(X ≤ x) = P(min(Y1,Y2,Y3) ≤ x)

= 1 - P(Y1 > x and Y2 > x and Y3 > x)

Since Y1,Y2,Y3 are independent,

= 1 - P(Y1 > x)P(Y2 > x)P(Y3 > x)

= 1 - (e^-x/θ)^3

Thus, the pdf of X is given by:

f_X(x) = d/dx[F_X(x)] = 3(e^-x/θ)^2 (1/θ)e^-x/θf, x>0

Using the formula for the variance of a continuous random variable, we get:

Var(θ(hat)4) = ∫0^∞ [x - E(θ(hat)4)]^2 f_X(x) dx

= ∫0^∞ [x - (3θ + 3θ^2)]^2 3(e^-x/θ)^2 (1/θ)e^-x/θf dx

= 6θ^2

Thus, Var(θ(hat)4) = 6θ^2.

Var(θ(hat)5) = Var(Y (bar)) = Var[(Y1+Y2+Y3)/3]

= (1/9)Var(Y1) + (1/9)Var(Y2) + (1/9)Var(Y3) + (2/9)Cov(Y1,Y2) + (2/9)Cov(Y1,Y3) + (2/9)Cov(Y2,Y3)

Since Y1,Y2,Y3 are independent, Cov(Yi,Yj) = 0 for i ≠ j.

Thus, Var(θ(hat)5) = (1/9)θ^2 + (1/9)θ^2 + (1/9)θ^2 = (1/3)θ^2.

Therefore, among the unbiased estimators, θ(hat)1, θ(hat)2, θ(hat)3, and θ(hat)5, the one with the smallest variance is θ(hat)2.

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For the given function, the critical point is (-1,2), relative extrema is is 2, and saddle points is zero.

To find the critical points of a function, we need to find where the partial derivatives of the function are equal to zero or do not exist. In other words, we need to find the points where the function is not changing with respect to x and y. The partial derivative of f(x,y) with respect to x is:

fx = 2x + 2

And the partial derivative of f(x,y) with respect to y is:

fy = 2y - 4

To find the critical points, we set both partial derivatives to zero and solve for x and y:

fx = 2x + 2 = 0

=> x = -1

fy = 2y - 4 = 0

=> y = 2

So, the critical point of the function is (-1, 2).

To determine whether this critical point is a relative maximum, minimum, or saddle point, we need to look at the second partial derivatives of the function. The second partial derivative of f(x,y) with respect to x is:

fx = 2

And the second partial derivative of f(x,y) with respect to y is:

fy = 2

The mixed partial derivative of f(x,y) with respect to x and y is:

fy = 0

To classify the critical point, we can use the second derivative test.

If fx and fy are both positive (or both negative) at the critical point, then the critical point is a relative minimum (or maximum), respectively.

If fx and fy have different signs, then the critical point is a saddle point. If the second derivative test is inconclusive, then we need to use additional methods to determine the nature of the critical point.

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Complete Question:

Find the critical points, relative extrema, and saddle points of the function. (If an answer does not exist, enter DNE.) f(x, y) = x² + y² + 2x - 4y + 2

Answer:

To form a rectangle, the piece of wire will have two sides of length x and two sides of length (18 - 2x)/2 = 9 - x. Therefore, the perimeter of the rectangle is given by:

2x + 2(9 - x) = 18 - 2x

The area of the rectangle is given by:

A = x(9 - x)

Expanding this expression, we get:

A = 9x - x^2

To find the dimensions of the rectangle with maximum area, we can differentiate the area expression with respect to x:

dA/dx = 9 - 2x

Setting this equal to zero to find the maximum:

9 - 2x = 0

x = 4.5

So, one side of the rectangle is x = 4.5 cm and the other side is (18 - 2x)/2 = 4.5 cm. Therefore, the dimensions of the rectangle with maximum area are 4.5 cm by 4.5 cm.

To calculate the maximum area, we can substitute x = 4.5 into the area expression:

A = 9(4.5) - (4.5)^2 = 20.25 cm^2

Step-by-step explanation:

The nullspace of matrix A found by solving the equation Ax=0. It is the nullspace of A is spanned by the vector [-2, 1, 0] and [0, -1, 1]. Any 3x2 matrix B that satisfies AB=0 belongs to the nullspace of A.

To find a 3×2 nonzero matrix B such that AB = 0, we need to find the nullspace of matrix A. The nullspace of a matrix A is the set of all vectors x such that Ax = 0.

Let's first write matrix A in row-echelon form:

1 2 1

0 -1 0

From this, we can see that the pivot variables are x1 and x2, and the free variable is x3. Thus, the general solution to Ax = 0 is given by:

x1 = -2x2 - x3

x2 = x2

x3 = x3

We can now write the columns of matrix B as:

[1, 0]

[-2, 1]

[0, -1]

To show that any such matrix B must have rank 1, we need to show that the columns of B are linearly dependent. Let's assume that B has rank 2. Then, the columns of B are linearly independent, and we can write:

c1[1, -2, 0] + c2[0, 1, -1] = [0, 0, 0]

where c1 and c2 are constants. This gives us the system of equations:

c1 = 0

-2c1 + c2 = 0

c2 = 0

which has only the trivial solution c1 = c2 = 0. This means that the columns of B are linearly dependent, and hence, any such matrix B must have rank 1.

To know more about Null space:

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_____The given question is incomplete, the complete question is given below:

For the given matrix A.= [1 2 1  1 1 1] find a 3 × 2 nonzero matrix B such that AB = 0 that any such matrix B must have rank 1. (Hint: The columns of B belong to the nullspace of A.] 0, Prove A= 13.421