Pls help I’ll brainlest ASAP

Answers

Answer 1

Answer:

Step-by-step explanation:

B is the best choice because the sample is random and represents a small portion of the entire school. The other choices are targeted for a specific group that wouldn't represent all students.

Answer 2

Answer:

Step-by-step explanation:

Related Questions

Help thanks in advance

Answers

Answer:

C) 2/7, 1/2, 5/6, 4/2

Step-by-step explanation:

I will mark branliest if correct

Answers

Answer:

The answer is: y = - |x+1|+1

I NEED HELP jimthompson5910

15. The price of a coat was reduced from $150 to $90. By what percentage was the price reduced?

16. Nate’s hourly pay rate was raised from $10 to $12. By what percentage was Nate’s pay raised?

17. A tree grew from a height of 8 feet to a height of 12 feet. By what percentage did the tree’s height increase?

18. This week only, the local coffee shop is reducing the price of a cup of coffee from $3 .00 to $2 .28. By what percentage is the price reduced?

19. On a sunny day, the area of a puddle decreased from 700 square inches to 560 square inches. By what percentage did the area decrease?

20. A baker increased the amount of chocolate in a recipe from 8 ounces to14 ounces. By what percentage was the amount of chocolate increased?

The price of an $8,000 car is temporarily reduced to $5,000. By what percentage is the price reduced?

22. Zoe needs to raise the reduced price of the car to its original price. By what percentage should she raise the reduced price?

Answers

15. 40%
16. 20%
17. 50%
18.24%
19. 20%
20. 75%
21. 37.5%
22. 60%

I'll do the first four problems to get you started

====================================================

Problem 15

Answer: 40%

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

Explanation:

The price dropped by $60, since 150-90 = 60. This is the discount, which is the amount you save. Divide this over the original price ($150) and we get 60/150 = 0.40 = 40%

Therefore, the price has been reduced by 40%. If we take 40% of 150, then 0.40*150 = 60 showing that 40% of $150 is 60 dollars. This matches up with the discount value mentioned earlier. So it helps verify the answer.

====================================================

Problem 16

Answer: 20%

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

Explanation:

The pay raised by 12-10 = 2 dollars. So the percent increase is 2/10 = 0.20 = 20%

Note how 20% of 10 = 0.20*10 = 2 is the pay raise amount; meaning that 2 is 20% of 10.

====================================================

Problem 17

Answer: 50%

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

Explanation:

I'll use a formula this time, but we could follow the same idea as the previous problems. This is to give another approach.

A = old value = 8

B = new value = 12

C = percent change

C = [ (B-A)/A ] * 100%

C = [ (12-8)/8 ] * 100%

C = (4/8)*100%

C = 0.50*100%

C = 50%

50% is the same as half of the value. Note how half of 8 is 4, ie 50% of 8 = 0.50*8 = 4. So this is the amount of increase when going from 8 to 12.

Side note: The "B-A" portion in the numerator represents the change in value. We divide this change over the original amount "A" and then multiply by 100% to get the percent change we're after.

====================================================

Problem 18

Answer: 24%

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

Explanation:

I'll use the formula again

A = old value = 3.00

B = new value = 2.28

C = percent change

C = [ (B-A)/A ] * 100%

C = [ (2.28-3.00)/3.00 ] * 100%

C = (-0.72/3.00)*100%

C = -0.24*100

C = -24%

The negative percent change means we have a percent decrease. So we have a 24% decrease. Since your teacher is asking about how much the percent reduction is, we'll write the positive version of this percentage.

Problems 19 through 22 will follow the same ideas as shown in the previous problems.

The table shows Kayden's quiz scores for a semester. What are the mean and the standard deviation, rounded to the nearest hundredth, for the quiz data?

45 48 42 47 43

Mean =

Standard deviation =

Answers

Answer:

The mean is of 45.

The standard deviation is 2.28.

Step-by-step explanation:

The mean is the sum of all values divided by the number of values.

The standard deviation is the square root of the sum of the difference squared between each value and the mean, and divided by the number of values.

Mean:

[tex]M = \frac{45 + 48 + 42 + 47 + 43}{5} = 45[/tex]

The mean is of 45.

Standard deviation:

[tex]M = \sqrt{\frac{(45-45)^2 + (48-45)^2 + (42-45)^2 + (47-45)^2 + (43-45)^2}{5}} = 2.28[/tex]

The standard deviation is 2.28.

Josephine has a rectangular garden with an area of 2x2 + x – 6 square feet.
Which expressions can represent the length and width of the garden?

length = x2 – 3 feet; width = 2 feet
length = 2x + 3 feet; width = x – 2 feet
length = 2x + 2 feet; width = x – 3 feet
length = 2x – 3 feet; width = x + 2 feet

Answers

why is no one writing down correct answers

Answer:

Step-by-step explanation:

having trouble i don't understand the problem

Answers

Answer:

a= 25/36

b= -1

c= -8/15

a=positive

b=negative

c=positive

Answer:

Step-by-step explanation:

details will be added

If A = (-2,-4) and B = (-8,4), what is the length of AE?
A. 12 units
B. 16 units
C. 10 units
D. 14 units

Answers

Answer:

It's C

Step-by-step explanation: How far is it from -2 to -8 horizontally?

They are 6 apart, right?

How far is -4 to 4 vertically? 8.

__________________________________________________________

6^2 + 8^2 = c^2

36 + 64 = c^2

c = 100 = 10

___________________________________________________________

So in short yea...it's C UwU

hey I need help with my coordinates

Answers

Ok send the picture so I can help you.

Answer:

what is the question? I can help

Step-by-step explanation:

In a class test (+ 5) marks are given for every correct answer and (–2) marks are given for every incorrect answer and no marks for not attempting any question.

(i) Rayan scored 30 marks. If she has got 10 correct answers, how many questions has she attempted incorrectly?

(ii) Riya scores 44 marks by attempting 13 questions. How many questions has he attempted correctly and how many has he attempted incorrectly?

Answers

OK ITS OK IM GOD CALM DOWN

Answer:

Step-by-step explanation:

(1)

If she got 10 answers right, she got 5 * 10 = 50 marks before anything was deducted.

Since she wound up with 30 marks, she lost 50 - 30 = 20 marks. If you don't feel comfortable with this, call it -20

Each incorrect answer cost her -2 marks.

Divide -20 /-2 = 10

She has answered 10 questions incorrectly.

(ii)

5x - 2y = 44

x + y = 13 Multiply this equation by 2

2x + 2y = 26

Rewrite the first and third equations

5x - 2y = 44

2x + 2y = 26 Add

7x = 70 Divide by 7

x = 70/7

x = 10

So 10 questions were answered correctly

x + y = 13

10 + y = 13

y = 3

Answer

10 were answered correctly

3 were answered incorrectly

How can you Divide the number 30 into 4 equal parts? Or can you?

Answers

Answer:

7.5

Step-by-step explanation:

thirty divided by 4 is 7.5 or 7 1/2

Answer:

That might be possible though.

Step-by-step explanation:

If you divide 30 by 7.5, you'll get 4. With any other number, you'll get 3,10,6,5,1, and 30. If you use a decimal, it might be possible it'll give you the answer you wanted.

A card is selected at random from a standard deck of playing cards.
Compute the probability that the card is a 3. (Enter the probability as a fraction.)

Answers

Answer:

It's 4/52

Step-by-step explanation:

because there is four threes in a standard deck of playing cards which has 52 cards in all.

Answer:

4/52 = 1/13

Step-by-step explanation:

the are four 3's in standard deck of cards

Three methods for teaching mathematics to first graders are to be compared. Ten students are
randomly assigned to each of the methods, and the score on a quiz is recorded. What are the
response and treatment for this experiment?

Answers

Answer: The three methods are the treatments and the response is the score achieved on the quiz.

Step-by-step explanation:

The three techniques are the treatments, and the results are the final score.

what is response variable in the experiment?

The researcher predicts that a variable will change if the controlled variable changes; this variable is known as a responsive variable. A dependent variable is another name for a responsive variable.

Solution:

Three methods are assigned for teaching mathematics.

Randomly ten students are assigned to each of the method.

There scores are then recorded on a quiz.

It is clear that the response will be the score card of the students either scoring high marks or not being able to clear it.

And the treatments are three for if the student is not able to understand any of the method.

Answers

Answer: The answer is D

Step-by-step explanation:

Edge 2021

A vehicle moves along a straight road. The vehicle's position is given by f(t) , where tt is measured in seconds since the vehicle starts moving. During the first 10 seconds of the motion, the vehicle's acceleration is proportional to the cube root of the time since the start. Which of the following differential equations describes this relationship, where k is a positive constant?

a. df/dt = kſ
b. df/dt - = kgf
c. d²f/dt = kyt dt2
d. d²f/dt = ky

Answer: 62

Step-by-step explanation: Set up your equation

21+x=2x-41 because the number (x) that 21 is added to is 41 less than (so subtraction) twice (so multiply the number x by 2) the number (x).Get the x's on one side by subtracting the single x21=x-41Now add 41 to both sides to completely isolate x62=xSo, your answer is x=62. The number is 62.

Check your work. 62+21=83. 2(62)= 124. 124-41=83. Both equations equal 83, so the solution is correct.

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