Alma wants to prove to her parents that listening to music while she studies for her tests will help her get better grades. She decides to ask 15 of her friends if they listen to music while they study for tests and what their grades are. She finds that her friends who have high grades also listen to music while they study for tests. She tells her parents that she has proven that listening to music while studying for tests will cause her grades to improve. What mistake has Alma made?

Answers

Answer 1

Answer: She asked her friends, which does not represent a random sample.

She tried to show cause and effect without doing an experiment (which includes simple random sample, control group, treatment, etc).

So the answer is she did not use a random sample, and tried to show cause and effect with an observational study.

Answer 2

Answer:

Answer:

She did not use a random sample, and she tried to show cause and effect with an observational study.

Hope this Helps! Mark Brainliest Please!

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oliver drove 90 mph of his journey in 1.5 hours and the remaining 120 miles in 3 hours. what was his average speed in the first part of his trip?

Зу = х - 9y = -x + 1
Using the graphing method, which of the following choices is the solution of the system?
A=(-3 ,-2)
B=(3 ,-2)
C= Infinite solutions
D= No solutions

Answers

Answer:

did i got it correct if yes follow plz

used a graphing tool to, well, graph it

see the solution in the screenshot, it's the point where the two lines intersect

jens motorboat travels at a speed of 15mph in still water, the river flows at a speed of 2pmh, how long will it take jen to travel 20mi upstream? 20mi downstream?

Answers

The speed of the motorboat travelling up stream will be 13mph, therefore it will take 20/13 hours to travel 20 miles upstream. This is about 1 and a half hours. The speed of the motorboat travelling downstream will be 17mph, therefore it will take 20/17 hours to travel 20 miles downstream. This is about 1 hour 10 minutes.

An equation in the system is y = x + 1. What is the other equation in the system if the solution is only at (0, 1)?x − y = 1

2x + 2y = 4

x + y = 1

x + 2y = 2

Answers

Answer:

The correct options are 3 and 4.

Step-by-step explanation:

An equation in the system is

$y=x+1$

The only one solution of the system of equation is (0,1). It means the equation must be satisfied by the point (0,1) and the equation is not equivalent to the given equation.

Two equations $a_1x+b_1y+c_1=0$ and $a_2x+b_2y+c_2=0$ are equivalent if

$(a_1)/(a_2)=(b_1)/(b_2)=(c_1)/(c_2)$

All the given equations are not equivalent equations because for all equation s

$(a_1)/(a_2)\neq (b_1)/(b_2)\neq (c_1)/(c_2)$

Check each equation by (0,1).

For equation 1,

$x-y=1$

$0-1=1$

$-1=1$

This statement is false, therefore the option 1 is incorrect.

For equation 2,

$2x+2y=4$

$2(0)+2(1)=4$

$2=4$

This statement is false, therefore the option 2 is incorrect.

For equation 3,

$x+y=1$

$0+1=1$

$1=1$

This statement is true, therefore the option 3 is correct.

For equation 4,

$x+2y=2$

$0+2(1)=2$

$2=2$

This statement is true, therefore the option 4 is correct.

A)
x − y = 1
0 - 1 = 1
-1 = 1

Not true.

B)
2x + 2y = 4
2(0) + 2(1) = 4
0 + 2 = 4
2 = 4
Not true

C)
x + y = 1
0 + 1 = 1
1 = 1
True

D)
x + 2y = 2
0 + 2(1) = 2
2 = 2
True

The answer is C and D.

What is The square root of 3 plus the square root of 1/3?

Answers

All very interesting, I suppose, but no correct answer appears yet.

The square root of 3 is 1.732051... (rounded)

The square root of 1/3 is 0.577350... (rounded)

Their sum is 2.309401... (rounded)

The product of (3+2i) and a complex number is (17+7i)

What is the complex number.

Answers

The question is asking us to find the complex number such that: ( 3 + 2 i ) * x = 17 + 7 i. We know that i^ 2 = - 1. x = ( 17 + 7 i ) / ( 3 + 2 i ) . We have to multiply the numerator and the denominator by ( 3 - 2 i ). Then: x = ( 17 + 7 i ) * ( 3 - 2 i ) / ( 9 - 4 i^2 ) = ( 51 - 34 i + 21 i - 14 i^2 ) / ( 9 + 4 ) = ( 51 + 14 - 13 i ) / 13 = ( 65 - 13 i ) / 13 = 65 / 13 - 13 i / 13 = 5 - i. Answer: The complex number is 5 - i.

What is the measure of an angle that turns through 1/3 of a circle

Answers

Answer: 360 degrees

Step-by-step explanation:

Multiply by 1/3. 360(1/3)=120.

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