Mathematics Middle School

Kai, a seventh grader, wants to determine the average number of times the families in his neighborhood visit the pool during the summer. He samples the families of four of his classmates. Which improvements could Kai make to his sample to increase the validity of the results? Select three choices.
sample more families
sample families that have children who are not in seventh grade
sample families that regularly use the pool
sample families whose answer to the survey question is predetermined
sample families living in every third house in the neighborhood
ANSWER BELOW HERE
B - sample families that have children who are not in seventh grade
D -sample families whose answer to the survey question is predetermined
E - sample families living in every third house in the neighborhood

Answers

Answer 1

Answer:

Step-by-step explanation:

Sample more families

sample families that have children who are not in seventh grade

sample families whose answer to the survey question is predetermined

Answer 2

Answer:

A,B,E

Step-by-step explanation:

Related Questions

Complete the statement to describe the meaning of the point shown in the graph.

Answers

Answer:

Part A: the employee makes $120 in 4 hours (s)

Part B: y= $120

120 dollars in 4 hours and y=120

which one doesn´t belong a,b,c or d

Answers

Answer:

Step-by-step explanation:

The correct answer is C

Gerry has $1200 in his savings account. How many years must he leave it in the account if he wants to earn $600 in interest and the interest rate is 5%? PLEASE SHOW WORK! :)

Answers

Answer:

10 years

Step-by-step explanation:

Find 5% of $1200 and then divide that number by 600

1200 x 0.05 = 60

600/60 = 10

Answer:

10 years

Step-by-step explanation:

0.5 x 1200 = 60

600 / 60

=10

Rectangle WXYZ is rotated by 90' dockwise about vertex X to create rectangle WXYZ Based on the definition of rotation, which of the following statements are true? Select all that apply
SA
m2WXW-90
mZXYZ = 90°
YZ parallel to YZ
YZ's parallel to WX

Answers

Answer:

m2WXW-90 and YZ parallel to YZ

Step-by-step explanation:

The answers are:

m2WXW-90°

MZXYZ = 90°

YZ parallel to YZ

(PLEASE HELP I WILL GIVE U A BRAINLY)Jonathan had a take out dinner that costed $22.50. He wanted to leave a 15% tip. What is the total bill including tips? Round it to the nearest 100ths.

Answers

Answer:

25.875

Step-by-step explanation:

Answer:

25.88

Step-by-step explanation:

Convert 15% to a decimal: 0.15

22.5 · .15= 3.375 (round to 3.38)

22.5+3.38=25.88

(14-16). A new mattress at the Mattress Store cost $625. They are running a Christmas sale where I can save off the original price. Tax in Indiana is 7% ?

How much money did I save from the discount?

How much did I pay in tax?

What would be the final cost of the mattress after the discount and tax are applied?

Answers

581.25 is what your paying and you are saveing 43.75

Answer:

You pay 581.25, but you save 43.75. :))

Step-by-step explanation:

Thank you guys so much for helping!

Answers

Answer:

dnnsnxbdd 107 73737

Step-by-step explanation:

pls do 2-4, no fake answers to get points i will give brainliest

Answers

-2 pretty sure hope this helps

Answer: -2.

Here’s how you solve questions like these:

First of all, you have to learn the rule on the number line.

if it’s an addition problem, go forward.

if it’s a subtraction problem, go backwards.

if the number is positive, turn to the right.

if the number is negative, turn to the left.

So pretend you’re in between a number line that goes from -10 to 10, or on 0.

< -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 >

Take the first number and look at the rule. Since 2 is positive, you start at that number and face to the right.

< -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 >
>
Next, you take the symbol in between the two numbers. Since it’s the minus sign, or a subtraction problem, you have to get ready to walk backwards But before you do that, check the last number. Since 4 is positive, you still have to face to the right and move 4 spaces backwards.

< -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 >
< < < <

If this is confusing, I’ll demonstrate it in the comments again.

Use the fraction models to solve the subtraction equation.

Five fraction models, the first four are completely shaded, and the last one is partitioned into six equal parts with four parts shaded. Below is the equation four and four sixths minus one and one third equals blank line.

three and two sixths
three and three sixths
three and three thirds
five and five ninths

Answers

3 2/6

the common denominator is six so multiply 2 to 1 1/3 to get 1 2/6 then subtract 4 4/6 by 1 2/6

Answer:

7 3/0 IS IT I THINK

Step-by-step explanation:

The following linear equation represents the line of best fit for the following scatter plot

y=0.15x-1.5

Use the equation to answer the following questions. Predict the number of hits a person would have to do to get 30 home runs.

A) 3
B) 210
C) 190
D) 6

Answers

Answer:

210 hits

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Equality Properties

Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtract Property of Equality

Step-by-step explanation:

Step 1: Define

y = home runs

x = hits

[Best Line of Fit] y = 0.15x - 1.5

We can use this to predict the average of the scatter plot.

home runs = y = 30

Step 2: Solve for x hits

Substitute [BLF]: 30 = 0.15x - 1.5Add 1.5 to both sides: 31.5 = 0.15xDivide 0.15 on both sides: 210 = xRewrite: x = 210

Remember that this is a prediction. According to the best line of fit, we would need 210 hits to get 30 home runs.

Mr. McGregor went to Target to buy four pairs of dress socks. There was a 30% off sale on the socks, and his total bill before tax was $14. What was the original price of each pair of socks?

Answers

Answer:

Each pair of socks cost $4.55

Step-by-step explanation:

14*.30=4.2

14+4.2=18.2

18.2/4= 4.55

It’s 4.55, all you gotta do is add 30% to 14 then divide it by 4

Helppp Meeeee plzzzzzzzzzz

Answers

Answer:

6.87

Step-by-step explanation:

hope this can help b/c u didnt tell me how much she bought per item

The answer is 6.87 good luck

i don't know what to put in the blacks please help me.

Answers

Answer:

easy

x:12345

y:5,10,15,20,25

Sam had $39 to buy Christmas presents for his family. He bought a $12 T-shirt for his sister , an $18 dollar bracelet for his mom, and he still needs to get his dad a CD.

What's the most amount of money he can spend on his Dad's present?

Answers

Answer:

the most he can send for his dad is 9 dollars

Step-by-step explanation:

There are 4 jacks in a standard deck of 52 playing cards. If Patricia selects a card at random, what is the probability that it will be a jack?
A. 1/52
B. 1/13
C. 1/2
D. 12/13

Answers

Answer:

B. 1/13

Step-by-step explanation:

52/4=13. 4/52=1/13

If you divide 52 by 4 you get 13 meaning
1/13 is the answer

Helpppppp!!!!!!!!!!!!!!!!!

Answers

Answer:

Step-by-step explanation:

Try and use m a t h w a y. It has all the answers. :)

M a t hway will help for sure

A runner is participating in a Boston marathon. He has run 12 miles out of a 26.2-mile section. What percent of the course has he run so far?

Answers

Answer:

146pecent point 2

Step-by-step explanation:

just dibpvide

I believe he ran 14.2 miles so far

Please answer this question
Show your work also

Answers

Answer:

t = -14

Step-by-step explanation:×

I did 4+3 which equals 7.

Now I know I need t/-2 to equal 7.

Next, I did 7×2 which equals 14.

When you divide 2 negative numbers you get a positive number.

So -14 ÷ -2 = 7

So t = -14

t= -14 this is the answer I hope this help

George wants to run 7 1/2 miles. The distance around a park is 1 1/5 miles. How many times must George run around the park to run the 7 1/2 miles?

Answers

6.25 because 7 1/2 divided by 1 1/5 is equal to 6 1/4 or 6.25

Please help me with this question

Answers

i’m not sure, maybe try going on quizzes

please help this is easy!!!!
It rained 15 inches in March. In May, it rained 6.108 inches less than in March. How much did it rain in May?

Answers

Answer:

8.892

Step-by-step explanation:

15-6.108= 8.892

It rained 8.89 inches in may

On a number line, the surface of a river is marked at -220 feet and the top of a building is marked at +19 feet, were 0 represents sea level. What do -220 and +19 represent?

Answers

Answer:

-220 and +19 represents levels bellow and above sea level

Step-by-step explanation:

levels below and above the sea lol

What is the perimeter of XYZ?

Answers

Answer:

Step-by-step explanation:

It’s b because when you find all sides of the perimeter you get b. the side is equal to 9 so the other side is 100% 9 also. so add 12 + 12 + 9 + 9. to get 42! hope this helps brainlist would be much appreciated.

answer quickly give brainiest answer

Part A: What is the area of the parallelogram? Show your work.

Part B: How can you decompose this parallelogram into two triangles? If this parallelogram was decomposed into two triangles, what would be the area of each triangle?

Answers

Answer:

A. 6

B. 3 and 3

Step-by-step explanation:

A) 8x3/4

B) since the area is three and you have to spit the triangle down the middle...

You draw a line diagonally from the top right corner to the bottom left corner and the area would be 3 and 3 because 6 in half is 3

Yes I checked it his answer is valid

coach made a deposit of $1,800 into an account that earns 2% simple interest.Find the amount of interest coach made in 3 years

Answers

Answer:

5508$

Step-by-step explanation:

So to find interest your formula is int=.02*1800

The answer is 36

Add your 36 and 1800 and that equals 1836

Now you multiply 1836 by 3. And that equals 5508

The expression (x14)(x−2)3 is equivalent to xn .

What is the value of n?

Enter your answer in the box.

n =

Answers

Answer:

the answer is in the screenshot that screenshot was taken by me so i didnt copy anyone :)

Step-by-step explanation:

yeah..

For the given expression, the value of n is 8.

What is an expression?

Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.

We have to given that;

The expression is,

⇒ (x¹⁴) (x⁻²)³ = xⁿ

So, Solve the expression by rule of exponent for the value of n,

⇒ (x¹⁴) (x⁻²)³ = xⁿ

⇒ (x¹⁴) (x⁻⁶) = xⁿ

⇒ x ¹⁴ ⁺ ⁻⁶ = xⁿ

⇒ x ¹⁴⁻⁶ = xⁿ

⇒ x⁸ = xⁿ

By comparing, we get;

⇒ n = 8

Learn more about the mathematical expression visit:

brainly.com/question/1859113

#SPJ2

I FREEking need help on this! You will get some POINTS for it ∵

Answers

What do you need help on? All I see is a y axis and x axis grid.

ok so if someone just wants the points tell don't answer this question comment and ill post a mother random one for 50 points just don't waste the answers please I really need help ill give brainliest but comment if u just want the points don't submit an answer

Answers

Answer:

i think its the 2nd one

Step-by-step explanation:

its hard to see but im pretty sure its that second option

sorry if its wrong

Answer:

Dish A has a greater rate of change

Step-by-step explanation:

For this question, the information is given in two different forms, in words and a graph, so you need to understand what everything represents. For dish A the starting number, 5, is the initial value, and the amount it grows every day, 2, is the rate of change. For dish B the y-intercept, 5, is the initial value, and the slope, 0, is the rate of change. From this, you can see that both the initial values are the same, which means both answers on the right are incorrect. Also since 2 is greater than 0 the bottom left answer must be incorrect. This only leaves the top left answer.

How much horsepower is needed to lift a box that is 10 pounds 3 feet in 10 seconds?

30 ft-lbs/sec
3 ft-lbs/sec
3000 ft-lbs/sec
300 ft-lbs/sec

Answers

Answer:

The answer to this question is 30 ft-Ibs/sec

Use the distributive property to write -2(n+9) as an equivalent expression.

Answers

Answer:

-2 x n + -2 x 9

-2n + -18

20n

Step-by-step explanation:

Hope it helps you

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