Having some struggles

If the speed of boat in still water iss 9 mph and takes 1.5 miles to go and come 4 miles uptream and downward then the current of the river is 9.24 mph.

Given that the speed in still water be 9 mph, time to travel 4 miles upstream and downward is 1.5 hours.

We are required to find the speed of current of the river.

let the speed of current be c mph.

Effective speed in downstream=9+c

Effective speed in upstream=9-c

Total time=1.5 hours.

Total distance=4 miles.

Time for upstream stream+ time for downward stream=1.5 hours

2/(9+c)+2/(9-c)=1.5

18-2c+18+2c=1.5(9+c)(9-c)

36=1.5(81-[tex]c^{2}[/tex])

36=121.5-1.5[tex]c^{2}[/tex]

1.5[tex]c^{2}[/tex]=121.5-36

[tex]c^{2}[/tex]=85.5

c=9.24 mph.

Hence the speed of the current of the river is 9.24 mph.

Learn more about speed at https://brainly.com/question/4931057

#SPJ4

Answer:

58.3%

Step-by-step explanation:

7/12 = 0.583333333

0.583333333 simplified is 58.3%

Answer:

Approximately 58.3%.

Step-by-step explanation:

7/12 ≈ 0.583

0.583 = 58.3%

Answer:   y = -x + 2

Step-by-step explanation:

Point slope form is y - y = m(x - x)

m = the slope of the line

Slope-intercept form is y = mx + b

m = the slope of the line

b = y-intercept

So because the - is in the m spot in the point-slope form, that means that is the slope of the line meaning it will also be in the m spot in slope-intercept form. The y-intercept of the line is found when x is 0.  When we look at the two coordinates provided you can see that one of them shows when x is 0.  We see that when x is 0, y is 2  which means that the y-intercept is 2.

So when you put the 2 in place of b,  you get   y = -x + 2

Answer:

20.8

Step-by-step explanation:

Just use the The Pythagorean Theorem

which is a^2+b^2=c^2

Someone answered it already.

https://brainly.com/question/23183334

The total number of different ways there are to put the cousins in the rooms is;  15

When we count the number of cousins staying in each room, it means that the possibilities are as follows; (4,0,0,0), (3,1,0,0), (2,2,0,0), (2,1,1,0), (1,1,1,1).

1) (4,0,0,0): This means that there is only 1 way to put all the cousins in the same room due to the fact that the rooms are identical.

2) (3,1,0,0): This means that there are 4 ways to choose which cousin will be in a different room than the others.

3) (2,2,0,0): This means that there are 3 ways to choose which of the other cousins will also stay in that room, and then the other two are automatically in the other room.

4) (2,1,1,0): This means that the number of ways to choose which cousins stay in the same room is; 4C2 = 6

5) (1,1,1,1): This means that there is only one way for all the cousins to the total number of possible arrangements is;

1 + 4 + 3 + 6 + 1 = 15each stay in a different room.

Therefore, the total number of possible arrangements is;

1 + 4 + 3 + 6 + 1 = 15

Read more about Probability Combinations at; https://brainly.com/question/3901018

#SPJ1

Answer: 73

Step-by-step explanation:

I think she's 73? You have to take multiples of nine and see if they work! I did 72 since I knew that 72 goes into 9 equally and if she is 73 there would be a remainder of 1. After that, I stuck with 73 and since I knew that 18 times 4 is also 72, I knew that 73 divided by 4 would give me 18 with a remainder of 1.

The solution is 37 years, that is, Mrs. Laura's age is 37 years old.

Given information in the problem:

1. Mrs. Laura's, L age is between 50 and 80.

2. When you divide age by 9, the remainder is 1.

3. When you divide age by 4, the remainder is also 1.

To find L exact age, start by checking multiples of 9 that leave a remainder of 1 when divided by 4:

9 × 1 + 1 = 10 (remainder of 1 when divided by 4)

9 × 2 + 1 = 19 (remainder of 1 when divided by 4)

9 × 3 + 1 = 28 (remainder of 1 when divided by 4)

9 × 4 + 1 = 37 (remainder of 1 when divided by 4)

9 × 5 + 1 = 46 (remainder of 2 when divided by 4)

9 × 6 + 1 = 55 (remainder of 3 when divided by 4)

9 × 7 + 1 = 64 (remainder of 0 when divided by 4)

Check multiples of 4 that leave a remainder of 1 when divided by 9:

4 × 1 + 1 = 5 (remainder of 1 when divided by 9)

4 × 2 + 1 = 9 (remainder of 1 when divided by 9)

4 × 3 + 1 = 13 (remainder of 4 when divided by 9)

4 × 4 + 1 = 17 (remainder of 8 when divided by 9)

From the above calculations, see that the only common number between the two sets of multiples is 37.

So, L's age is 37 years old.

Learn more about Multiplication here:

https://brainly.com/question/24327271

#SPJ3

The current drawn by 9 identical motors will be 124.2 amps current

Current is the flow of electrical charge carriers like electrons. Current flows from negative to positive points. The SI unit for measuring electric current is the ampere (A). One ampere of current is defined as one coulomb of electrical charge moving past a unique point in a second.

since , one motor of 2hp draws = 13.8 amps current

hence , 9 identical motor will pull = 13.8 * 9 (each will pull same amount of current )

                                                         = 124.2 amps current

The current drawn by 9 identical motors will be 124.2 amps current

To learn more about current

https://brainly.com/question/23323183?referrer=searchResults

#SPJ1

Answer:

(a)

    A = 3

    B = 17

    C = 8

    D = 15

(b)

surface area = 240

(using the formula)

Answer:

Rs 1808

Step-by-step explanation:

Sp=Selling price

Mp=main price

Answer:

a = 1500     b = .97

Step-by-step explanation:

1500 ( .97)^x       = bone density after n years

                              3% loss leave 97% each year   (.97 in decimal)

Answer:

Graph B is not linear.

Step-by-step explanation:

This question asks for a linear relationship. Graph B is not linear.

Please look closely at the attached images where I gave graphed these points.

I hope this helps. Please let me know if you have questions.

Answer:

$1.00 = 10 cent each

Step-by-step explanation:

Answer: 18

Step-by-step explanation:

By the exterior angle theorem,

[tex]x+18+x+12=x+48\\\\2x+30=x+48\\\\x+30=48\\\\x=18[/tex]

Answer:

x = 18

Step-by-step explanation:

The sum of two interior angles im a triangle is equal to one exterior angle that is supplementary to the third interior angle:

x + 18 + x + 12 = x + 48 add like terms

2x + 30 = x + 48 transfer like terms to the same side of the equation

2x - x = 48 - 30

x = 18

Answer:

[tex]\sf \dfrac{\sqrt{6}+\sqrt{2}}{4}[/tex]

Step-by-step explanation:

   75 = 45 + 30

Sin (x + y) = Sin x *Cos y + Cos x * Sin y

Sin (45 + 30) = Sin 45 * Cos 30 + Cos 45 * Sin 30

                      [tex]\sf =\dfrac{1}{\sqrt{2}}*\dfrac{\sqrt{3}}{2}+\dfrac{1}{\sqrt{2}}* \dfrac{1}{2}\\\\\\=\dfrac{\sqrt{3}}{2\sqrt{2}}+\dfrac{1}{2\sqrt{2}}\\\\\\=\dfrac{\sqrt{3}*\sqrt{2}}{2*\sqrt{2}*\sqrt{2}}+\dfrac{1*\sqrt{2}}{2\sqrt{2}*\sqrt{2}}\\\\\\=\dfrac{\sqrt{6}}{2*2}+\dfrac{\sqrt{2}}{2*2}\\\\\\=\dfrac{\sqrt{6}+\sqrt{2}}{4}[/tex]

Answer:

in a triangle prism each cross section parallel to the triangular base is a triangle congruent to the base

There can be 18, 12, 9, 6, 4 , 3 or 2 students on each team depending on the number of teams selected.

Considering there are at least 2 teams but no more than 19 teams, let's calculate the number of students in each case:

Learn more about teams in: https://brainly.com/question/10750297

#SPJ1

The properties of a Circle with their definitions are; As highlighted below

1) The distance around a circle is called; Circumference

2) A portion of the circumference of a circle is called; Arc Length

3) The distance from the center to any point on a circle is called; Radius.

4) The distance through the center between points on a circle is called; Diameter

5) The degree measurement of an arc (in reference to its central

angle) is called; Arc Measure

6) An arc which measures less than 180° is called; Minor arc

7) An arc which measures exactly 180° is called; Semi Circle

Read more about Properties of a Circle at; https://brainly.com/question/17072060

#SPJ1

Answer:

In my opinion, it would be 'y', since it is already on its own (in the first equation) without any coefficients.

Answer:

x.

Step-by-step explanation:

x because if you multiply the first equation by 2 and add the result to equation 2 , the y's will cancel out.

2x + y = 9   Times 2:-

4x + 2y = 18

3x - 2y = 17     Adding:-

7x = 35

x = 5.

The simplified form of R(x) is [tex]R(x) =\frac{x^{2} -13x+42}{x^{2} -10x+25}[/tex]

From the question, we are to simplify the expression

From the given information,

[tex]f(x) =\frac{x^{2}-11x+28 }{x^{2}-11x+30}[/tex]

and

[tex]g(x) =\frac{x^{2}-9x+20 }{x^{2}-12x+36}[/tex]

Also,

[tex]R(x) = f(x) \div g(x)[/tex]

∴ [tex]R(x) =\frac{x^{2}-11x+28 }{x^{2}-11x+30} \div \frac{x^{2}-9x+20 }{x^{2}-12x+36}[/tex]

[tex]R(x) =\frac{x^{2}-11x+28 }{x^{2}-11x+30} \times \frac{x^{2}-12x+36 }{x^{2}-9x+20}[/tex]

Factoring each of the quadratics

[tex]R(x) =\frac{x^{2}-7x-4x+28 }{x^{2}-6x-5x+30} \times \frac{x^{2}-6x-6x+36 }{x^{2}-4x-5x+20}[/tex]

[tex]R(x) =\frac{x(x-7)-4(x-7) }{x(x-6)-5(x-6)} \times \frac{x(x-6)-6(x-6) }{x(x-4)-5(x-4)}[/tex]

[tex]R(x) =\frac{(x-4)(x-7)}{(x-5)(x-6)} \times \frac{(x-6)(x-6)}{(x-5)(x-4)}[/tex]

Simplifying

[tex]R(x) =\frac{(x-7)}{(x-5)} \times \frac{(x-6)}{(x-5)}[/tex]

[tex]R(x) =\frac{(x-7)(x-6)}{(x-5)(x-5)}[/tex]

[tex]R(x) =\frac{x^{2} -6x-7x+42}{x^{2} -5x-5x+25}[/tex]

[tex]R(x) =\frac{x^{2} -13x+42}{x^{2} -10x+25}[/tex]

Hence, the simplified form of R(x) is [tex]R(x) =\frac{x^{2} -13x+42}{x^{2} -10x+25}[/tex]

Learn more on Simplifying an expression here: https://brainly.com/question/1280754

#SPJ1

The polynomial's maximum value is relative.

Here we have the polynomial:

[tex]V(x) = 36x^2 - 3.75x^3[/tex]

Notice that the leading coefficient is negative, so, as x tends to negative infinite, V(x) will tend to positive infinite.

So we only have a relative maximum, because is local maximum (at x = 6.4), but the function can take larger values than that.

You can also check that on the graph of V(x), which you can see below:

If you want to learn more about maximums:

https://brainly.com/question/1938915

#SPJ1

The way to use the distance formula to classify quadrilateral include:

The steps to calculate the perimeter and area of a polygon:

Step 1: Plot the given points on the graph.

Step 2: Connect the points and identify the figure.

Step 3: Determine lengths by counting the grid lines.

Step 4: Use a formula to calculate the perimeter and area if one exists.

Step 5: If there are no formulas for a figure, the perimeter can be calculated by summing the lengths of the sides. We might estimate the area without an area formula by counting the number of small squares enclosed.

Learn more about coordinate geometry on:

brainly.com/question/18269861

#SPJ1

Answer:

33.3

Step-by-step explanation:

The scale factor is 2/3.

The ratio of the surface areas is the square of the scale factor, so the surface area of the smaller cone is 75(2/3)², which is about 33.3 cm²

The missing data item for the given set of data if the median of the complete data set is 15 is 11; option F

Data set: 11, 23, 12, 18, 11, 10, 19, 15, 19, 21, 13, 17, 24, 14

Median = Sum of data + n / number of data

15 = (11+23+12+18+11+10+19+15+19+21+13+17+24+14) + n / 15

15 = 214 + n / 15

15 × 15 = 214 + n

225 = 214 + n

n = 225 - 214

n = 11

Learn more about median:

https://brainly.com/question/469292

#SPJ1

The solution of the system would be (3,6).

Lets solve the problem,

Other equation: y = 1/3x+5

Slope-Intercept Form: y = mx + b

Slope Formula:

y2-y1/x2-x1 = m

Have to find equation now:

m = (6 - 5)/(3 - 0)

m = 1/3

y = 1/3x + b

5 = 1/3(0) + b

b=5

y = 1/3x + 5

Lets put the substituition method here,

1/3x + 5 = -1/3x + 7

2/3x + 5 = 7

2/3x = 2

x = 3

y = 1/3(3) + 5

y = 1 + 5

y = 6

Therefore the coordinates are (3,6)

Learn more about Linear Equation on:

https://brainly.com/question/19954463

#SPJ4

You would multiply the change per hour by number of hours to get -2h

That would be added to the starting temperature.

Answer: B, t = -2h + 32

Answer: The answer is B

Step-by-step explanation:

The question says it drops ( which means subtraction) by 2 degrees every hour, so -2h

The larger number is 32 and the smaller number is 28 given that one number is 4 more than another and their sum is 60. This can be obtained by forming algebraic equation and finding

Given that one number is 4 more than another,

⇒x = y + 4              (equation (1))

Their sum is 60,

⇒x + y = 60

y + 4 + y = 60      (From (1))

2y + 4 = 60

2y = 56 ⇒ y = 28

x = y + 4 = 28 + 4 = 32

Hence the larger number is 32 and the smaller number is 28 given that one number is 4 more than another and their sum is 60.

Learn more about algebraic expressions here:

brainly.com/question/19245500

#SPJ1