Every fifth student who walked into the middle school was surveyed to determine his or her favorite subject. Out of 150 students, 90 students stated that they like math class best. The staff concluded that about 60% of students like math class best. Is the sample method valid? Justify your answer.
a)

The conclusion is invalid. This is a biased voluntary response sample.


b)

The conclusion is invalid. This is a biased convenience sample.


c)

The conclusion is valid. This is an unbiased systematic random sample.


d)

The conclusion is valid. This is an unbiased simple random sample.

Answer:

C

Step-by-step explanation:

plsss help me i also dont understand this

Please answer all the questions in the pictures attached today. If you steal my points, you will be reported ASAP!! Thank you! :)

does anyone know this?

Do not mind the bottom just look at the top also please help me

please help
1. The product of eleven times a number less than 12
A. 11n - 12
B. 12 - 11n
C. 12n - 11
D. 11(n - 12)

Solve for zzz: -0.25z = -1.25−0.25z=−1.25minus, 0, point, 25, z, equals, minus, 1, point, 25 z =\,z=z, equals

NEED HELP ASAP
Alan used the expression StartFraction 5 over 9 EndFraction (F minus 32), where F is a temperature in degrees Fahrenheit, to convert a temperature from Fahrenheit to Celsius. He evaluated the expression as shown below and found that 45 degrees Fahrenheit was equivalent to –7 degrees Celsius.

StartFraction 5 over 9 EndFraction (F minus 32) = StartFraction 5 over 9 (45 minus 32) = 25 minus 32 = negative 7

What error did Alan make?
He substituted 45 for F instead of –7 and should have found the answer to be Negative 21 and two-thirds degrees Celsius.
He did not combine within the parentheses first before multiplying and should have found the answer to be 7 and StartFraction 2 over 9 EndFraction degrees Celsius.
He multiplied 45 by the fraction incorrectly and should have found the answer to be 49 degrees Celsius.
He divided 5F by 9 before subtracting 32 and should have found the answer to be 21 and StartFraction 4 over 9 EndFraction degrees Celsius.

proof that ur lying.

I really need help!! Which box doesn't belong??

Amara is raking leaves. She fills up 7 large bags with them in 3 hours. Answer the following
questions based on this information.

(a) At this rate, how many bags could she
fill in 9 hours? Justify how you found
your answer.

(b) What is the unit rate at which Amara is
raking leaves? Express your answer in
simplest form using appropriate “per”
units.

Find the distance between C and D
C:(4, -5) D:(-3, -5)

These 2 questions are worth 35 points for the brainliest user. If you answer these two questions, I will answer any of yours for a brainliest on the ones that I answer right. Whoever answers these 2 questions first gets a brainliest.

1.) Which of the following list of side lengths could form a triangle?

10, 12, and 25
5, 6, and 12
2, 2, and 4
4, 5, and 6

2.) Which of the following sets of measures for sides doesn't form a triangle?

7, 9, 17
14, 18, 18
8, 8, 8
3, 3, 5

PLEASE HELP!!!!! AND TAHNK YOU

Use the distributive property to create an equivalent expression to the equation 9(2j + 5j).

An antique collectible has a value of $235 right now. It will increase in value by 9% each year. Find the value the collectible after 16 years, A.$2115 B. $1017 C.$856 D.933

I need help on Part C!! PLEASE!
The Barker family just left the local pet store with Lucky, their new family dog. The pet store owner told the Barker family that for the next 6 months, Lucky would grow at an average rate of 9 pounds per month. Currently, Lucky is 2 months old and weighs 3 pounds.

Part A: Complete the given table that represents Lucky's current weight, in pounds, as a function of his age, in months.
Part B: Graph the data in the table from Part A. Be sure to label the graph and all data points.
Part C: Create a linear model that represents the Lucky's current weight, in pounds, as a function of his age, in months.
Part D: If Lucky continues to grow at the rate of 9 pounds per month beyond the expected six months, how much will Lucky weigh by the time he is one year old?

A manufacturer of flea collars for animals injects the collars with 15 milligrams of a medicine that only acts on fleas. The manufacturer will only sell collars with at least 14 milligrams and no more than 16 milligrams of medicine. The following list shows the result of sampling 36 collars from an actual production run of 720 collars.



A) Based on this sample, what percent of the collars would be acceptable? Explain how you got your answer.

B) Based on this sample, how many collars would you expect the manufacturer to reject?

Pepino’s pizza charges $8 for medium pizza plus $2 for each topping. How many toppings are on a medium pizza that costs $20?

Jada explains how she finds 15*23
"I know that ten 23s is 230 so 5 23s will be half of 230 which is 115. 15 is 10 plus 5, so 15*23 is 230 plus 115, which is 345

a.Do you agree with Jada?Explain

A jar contains 1,000 marbles. Omar is entering a contest to guess the number of any one color of marbles in the jar. He is allowed to take four random samples of 200 marbles, and his results are shown in the table.

Sample Blue/Green/Red/White
1. 82 42 36 40
2. 70 51 49 30
3. 58 66 45 31
4. 65 62 38 35
Which statements are true? Choose all that apply. (There are three correct answers).
A.There are probably more white marbles than green marbles in the jar.
B. There are likely more blue marbles in the jar than any other color.
C.The ratio of the number of red marbles in the jar to the number of green marbles in the jar is most likely greater than the ratio of the number of white marbles in the jar to the number of blue marbles in the jar.
D. The number of green marbles in the jar is approximately 21% to 33% of the marbles in the jar.
E.The total number of red marbles in the jar is approximately 168.

What should I put for x in the box? first to answer is brainliest

i forgot to put the picture so- but pls help me don't just put something random

Are my answers correct??

hi! can someone please help? i added a pic so that u can see what i need help on. hopefully it helps

Steve has two cans containing biscuit dough. The cans are cylindrical and their dimensions (in inches) are as follows.
• Can A: h = 10 and r = 0.6
• Can B: h = 5 and r = 1.2

Which of the following statements about the volumes of the cans is true?
A. The volume of can A is twice the volume of can B.

B. The volume of can B is twice the volume of can A.

C. The volumes of the two cans are equal.

D. The volume of can A is four times the volume of can B.

can somebody please help me and explain a little bit? :(

Write a numerical expression to match the word expression. ) Two less than one-third of the product of nine fourths and twelve 12 1 3 2 alt ( x 12) 4​

If 33% of people chose vanilla and 19% chose chocolate as their favorite flavor of ice cream, what percent of people chose a flavor other than vanilla or chocolate

Topic 12 Online math help

What will happen? (Newton's 1st Law Egg Drop)