Answer: e. An experiment imposes treatments on the subjects, but an observational study does not.
Step-by-step explanation:
Experiment is scientific procedure that is undertaken by an individual or a researcher in order for the person to either make a discovery, or test a hypothesis.
Observational studies are the studies whereby the researchers just observe the impact of a treatment or risk factor e.g. cohort studies. In observational study, the researchers just collect data based on what they've either heard or seen and they've no control over such variables collected whole for an experiment, treatments are applied to a group and the effects are recorded.
Which is the value of the smaller zero defined by the function f (x) = 25x² – 4?
Let's see
[tex]\\ \sf\longmapsto 25x^2-4=0[/tex]
[tex]\\ \sf\longmapsto 25x^2=4[/tex]
[tex]\\ \sf\longmapsto (5x)^2=2^2[/tex]
[tex]\\ \sf\longmapsto 5x=2[/tex]
[tex]\\ \sf\longmapsto x=\dfrac{2}{5}[/tex]
Smallest zero 2/5Please help. related to division
[tex]
{\huge{\mathtt{\orange{\underline{\blue{ANSWER -}}}}}}[/tex]
The error is that,
-14x is added to 12x^2,
while both have different variables,
Terms with different variables could not be added or subtracted. Hence, the division can not be completed.
A sample was taken of dogs at a local dog park on two random days. The counts are displayed in the table below. If there are estimated to be 50 dogs at the park at any given time, which proportion could be used to find the average number of shepherd mixes at the park at any given time?
Dog Park Sample
Sample 1
Sample 2
Labrador Retriever
4
Labrador Retriever
5
Shepherd Mix
7
Shepherd Mix
9
Chihuahua
3
Chihuahua
5
Poodle
1
Poodle
2
Australian Cattle Dog
2
Australian Cattle Dog
4
StartFraction 8 over 21 EndFraction = StartFraction x over 50 EndFraction
StartFraction 16 over 21 EndFraction = StartFraction x over 50 EndFraction
StartFraction 8 over 50 EndFraction = StartFraction x over 42 EndFraction
StartFraction 7 over 9 EndFraction = StartFraction x over 50 EndFraction
Answer:
a
Step-by-step explanation:
according to the department of agriculture consuming 100 grams of banana provides 0.15 milligrams of zinc which of the following is closest to the number of milligrams of zinc provided by 140 grams of banana?
A. 0.15
b. 0.21
C 0.25
D. 0.93
The answer is B how did they get that????
Answer:
x = 0.21
Step-by-step explanation:
[tex]\frac{.15}{100} = \frac{x}{140}[/tex]
.15(140) = 100x
21 = 100x
x = 0.21
The number of milligrams of zinc provided by 140 grams of banana will be 0.21 milligrams. Then the correct option is B.
What are ratio and proportion?A ratio is a collection of ordered integers a and b represented as a/b, with b never equaling zero. A proportionate expression is one in which two items are equal.
According to the department of agriculture consuming 100 grams of banana provides 0.15 milligrams of zinc.
Then the number of milligrams of zinc provided by 140 grams of banana will be given by the ratio.
Let x be the amount of zinc. Then the equation is given as,
x / 140 = 0.15 / 100
x / 1.4 = 0.15
x = 0.21 milligrams
The number of milligrams of zinc provided by 140 grams of banana will be 0.21 milligrams. Then the correct option is B.
More about the ratio and the proportion link is given below.
https://brainly.com/question/14335762
#SPJ2
In 2019, the average high school GPA for incoming University of Maryland freshman was 4.32 with a standard deviation of 0.285. Suppose UMD freshman are randomly assigned into groups of 25.
Note that this scenario is talking about a sampling distribution since the students are put into groups of size 25. Therefore, you will need to calculate the standard deviation using a formula before using the normalcdf and invNorm commands.
a) What is the mean of the sampling distribution of all samples like this:
b) What is the standard deviation of the sampling distribution of all samples like this:
Give the formula with values that you entered in your calculator as a way of showing your work:
Give your final answer rounded to 3 decimal places:
c) What is the probability of a group having an average high school GPA below 4.1?
Give the command and values you used as a way of showing your work:
Give your final answer rounded to 6 decimal places or write your final answer in scientific notation rounded to one decimal place:
Answer a what is the mean of the sampling distribution of all samples like this
Step-by-step explanation:
Natalie has 28 erasers she divided some of her erasers equally among 3 friends Natalie has 10 erasers left how many erasers did each friend get
Answer:
Each friend gets 6 erasers
Step-by-step explanation:
Start by subtracting the number of erasers Natalie has left from 28 to get 18, then divide 18 by 3 to get 6. Each friend gets 6 erasers.
Hopefully this helps - let me know if you have any questions!
State the number of complex zeros and the possible regional zeros for the function
Show steps
Answer:
D) 2 complex zeros; rational zeros among ±{1, 5, 7, 35}
Step-by-step explanation:
The signs of the coefficients of the polynomial are (+ + + +). They are all the same; there are 0 sign changes. When odd-degree terms change sign, the signs are (- + - +). There are 3 changes: -→+, +→-, -→+.
Descarte's Rule of Signs tells you the lack of sign changes among the coefficients means there are 0 positive real roots. When the signs of odd-degree terms are changed, there are then 3 sign changes, indicating 1 or 3 negative real roots and 2 or 0 complex roots.
There are possibly 2 complex roots.
__
The Rational Root Theorem tells you any possible rational roots will be divisors of the constant term, 35. Those divisors are ±1, ±5, ±7, ±35.
Possible rational roots are ±1, ±5, ±7, ±35.
_____
Additional comments
A graphing calculator shows the one rational root to be x=-5. The other two real roots are irrational (-3±√2). All are negative, as predicted.
__
Complex roots always come in conjugate pairs, so there will always be an even number of complex roots. This means an odd-degree polynomial will always have at least one (1) real root.
We can shorten the list of possible rational roots by remembering that there are 0 positive real roots. Then possible rational roots are -1, -5, -7, -35. In this problem, you're merely supposed to apply the rule, and not refine the result.
Changing the signs of odd-degree terms is equivalent to reflecting the function over the y-axis. That suddenly makes negative real roots into positive real roots, so the sign change rule can be applied as for positive real roots.
andrei has a glass tank. first he wants to put in some marbles, each of which has a volume of 0.04 liters. the, he wants to fill the tank with water until its completely full. if he uses 50 marbles he will have to add 33 liters of water,
what is the volume of the tank?
Answer:
35 liters
Step-by-step explanation:
The volume of 50 marbles will be ...
50 × 0.04 L = 2.00 L
Adding 33 liters of water to that volume of marbles will bring the total volume of material in the tank to ...
2 L + 33 L = 35 L . . . . volume of full tank
A piece of quilting fabric is 31 1/2 inches wide. It will be cut into strips that are each 2 1/4 inches wide. How many strips can be cut from the fabric?
12
13
14
15
the answer is 14 strips of fabric.
What is an equation of the line that passes through the points (-5, -7) and (-5,6)?
Answer:
what your looking for this? slope intercept distance? dm
Type the correct answer in the box. The value of v12/v10xv5/v6 is closest to the whole number . PLEASE ANSWER QUICKLY AND CORRECTLY WILL GIVE BRAINLIEST
Answer:
1
Step-by-step explanation:
[tex]\dfrac{\sqrt{12} }{\sqrt{10} }\cdot \dfrac{\sqrt{5} }{\sqrt{6} }=\dfrac{\sqrt{12 \cdot 5} }{\sqrt{10 \cdot 6} }=\dfrac{\sqrt{60} }{\sqrt{60} }=1[/tex]
Answer:
Step-by-step explanation:
1012 ⋅65 = 10⋅612⋅5 = 6060 =1
Step-by-step explanation:
C CARRY ON LEARNING
A song has 12 beats every 5 seconds . How many beats are there in 30 seconds?
Answer:
72 beats
Step-by-step explanation:
sec | 5 | 30
beats | 12 | x
30 divided by 5 = 6
12 times 6 = 72
5. Simplify the expression and find its value when p= 4 and q = -5:
(i) 3 ( p2q + pq2 – pq ) – 6 pq + 3pq2
Step-by-step explanation:
[tex] \bf \blue{ \boxed{ \bf p = 4 \: \: and \: \: q = - 5 \Rightarrow pq = 4 \times ( - 5) = - 20}} [/tex]
3(p2q + pq2 - pq) - 6pq + 3pq2 =
3[-20 × 2 + (-20) × 2 - (-20)] - 6 × (-20) + 3 × 2 × (-20) =
3[-40 + (-40) + 20] - 6 × (-20) + 3 × 2 × (-20) =
3(-40 - 40 + 20) - 6 × (-20) + 3 × 2 × (-20) =
3(-80 + 20) - 6 × (-20) + 3 × 2 × (-20) =
3 × (-60) - 6 × (-20) + 3 × 2 × (-20) =
-180 + 120 + 6 × (-20) =
-180 + 120 + (-120) =
-180 + 120 - 120 =
-60 - 120 = -180
Answer:
-180
Step-by-step explanation:
3 ( p2q + Pq2 - pq ) - 6 pq +3pq2
3 [(4)(2)(-5) + (4)(-5)(2) - (4)(-5)] -6 (4)(-5) +3(4)(-5)(2)
3(-40-40+20) + 120 -120
3(-60) +0
-180+0
-180
The number of students attending the seventh grade class trip is 4 times the number of teachers attending. What Is tge ratio of teachers to studets attending the class trip?
Answer:
1:4
Step-by-step explanation:
pls heart and give brainliest much appreciated
Answer:
1:4
Step-by-step explanation:
1:4 ok bye, bc I needa ask sum questions so dont come 4 me
pls give me some examples thank you!
DIRECTION: Look around your kitchen and draw at least two real objects that are plane figures and two real object that are solid figures. Put your drawings on the boxes provided below.
Solid Figures;
Plane figures;
Answer:
solid figure: refrigeration
plane figure: table
Answer:
A plane figure is a geometric figure that has no thickness. It lies entirely in one plane.
A solid figure is a three-dimensional (3D) shape or geometric figure that has length, width and height.
Plane figure
Place mat (rectangle)
Dish cloth (square)
Plate (circle)
Solid figure
Can of food (cylinder)
Washing sponge (cuboid)
Orange (sphere)
Which equation represents the relationship between the angles shown below?
Answer:
4x + 44 = 180
Step-by-step explanation:
4x = 180- 44
4x = 136
x= 136÷ 4
x= 34
Answer:
4x + 44 = 180
Step-by-step explanation:
sum of angles on a straight line = 180
4x + 44 = 180
subtract 44 from both sides
4x + 44 - 44 = 180 - 44
4x = 136
Divide both sides by the coeficient of x
4x = 136
4 4
x = 34
the sum of two numbers is 60. the difference of the two different of the two numbers is -12. what are the two numbers
Answer:
the numbers are 24 and 36
Step-by-step explanation:
y+x=60
y-x= -12
add them
2y= 48
y= 24
x= 60-24
x=36
Please help. I will give brainliest and all my points.
Answer alternate exterior angles theorem
Step-by-step explanation
just do it
After a baby was born, she began to gain weigh at a rate of 2 pounds per month. The weight of the baby at birth was 8 pounds. Write an equation for W, in terms of t, representing weight, in pounds, of the newborn baby t months after birth.
Answer:
W x T = 8 or 2w x t = 8
Step-by-step explanation:
Answer:
W=1.5t+12
Step-by-step explanation:
I got it wrong and it told me this was correct
N
What is the value of y?
O 3/3 units
9
O 6/3 units
O 95 units
3
O 1273 units
T
6
M
Answer: B
Step-by-step explanation:
Answer:
B
Step-by-step explanation:
You are creating a 25:1 scale model of our classroom and find that our classroom has a length of 30 feet. What is the length of the classroom wall in the scale model in inches?
Answer:
1.2 feet
Step-by-step explanation:
25 : 1 = 30 : x
x = 30/25 = 6/5 = 1.2 feet
Without graphing, determine how many x-intercepts the function has.
y=3x^2 + 3x +4
y = 2x^2 + 3x + 3 has 0 x intercepts
y = 3x^2 + 3x + 4 has 0 x intercepts
Need help I’m stuck on 4 of these
Answer:
A
Step-by-step explanation:
PLEASE HELP ME ASAP
Its not that hard im just tired
Answer:
combine like terms; 15.4z - 12
How many years is 10000 hours? [365 days = 1.0 year] *
There is 24 hours in a day. Therefore, there are 8760 hours in a 365-day calendar year (365 x 24 = 8760).
How many years is 10000 hours?
Take the total number of hours and divide it by the number of hours in a year.
10000/8760 = 1.1415
Therefore, 10000 hours is approximately 1.14 of a year.
4) The length of a rectangle is double its width. Its perimeter is 33cm. How long is its
width?
5.5 cm
Step-by-step explanation:
Let x be the width of the rectangle.
Since the length is double the width, the length would be 2x.
x can be found by solving the perimeter equation. The perimeter of the rectangle can be found by the equation:
[tex]p = 2(l + w)[/tex]
[tex]33 = 2(2x + x)[/tex]
[tex]33 \div 2 = (2x + x)[/tex]
[tex]16.5 = 3x[/tex]
[tex]16.5 \div 3 = x[/tex]
[tex]5.5 = x[/tex]
Therefore, the width of the rectangle is 5.5 cm.
12. The thickness of a plywood is 11 mm.
(i) How many centimetres is this?
(ii) what part of a metre is mm
Answer:
I) 1.1cm
II) 0.001m = 1mm
Step-by-step explanation:
I)
10mm = 1 cm
11mm = ?
? = (11 x 1)/10 =11/10 =1.1
II)
1000mm = 1m
Milli represents 10^-3 = 0.001
1 millimeter = 1 x 0.001 =0.001m
have this done for brainliest
Answer:
HEYYYYY HOW ARE YOUUUU :)
Step-by-step explanation:
5x - 5 + 2x 6: PEMDAS
5x - 5 + 2x + 6: order of operation??
5x + 2x - 5 + 6: Combine like terms
7x + 1: Your answer...
Ok I need help with this one 7:56 est!
Answer:
c
Step-by-step explanation:
I had the question before eee
Marcus wants to buy a car for $8,000. He currently has saved $3,450. His job allows him to save $225a week (w). What equation represents his savings (S) to buy a car?
Answer:
Im guessing your asking how many weeks he needs to work, he needs to work 20.2 weeks to get enough for the car. You can easily make a equation with this answer comment on this if you want me to make the equation for you
Step-by-step explanation: