Luc randomly selected 40 students and asked them whether they had ever gone snowboarding. He repeated this survey using the same method three more times.Do any of the surveys appear to be biased?

Ever gone snowboarding? Survey
1 2 3 4
Yes 10 13 2 12
No 30 27 38 28

A.
Yes, because the results from Survey 3 differ significantly from results from Surveys 1, 2, and 4, which agree.

B.
Yes, because all four surveys do not have identical results.

C.
No, because although the results differ among the four surveys, the sample method used for all was the same.

D.
No, because all four surveys have about the same number of people saying “yes” and about the same number of people saying “no.”

Answers

Answer 1

Answer: It's C. You will always get different results, but this doesn't mean you are biased.

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I honestly have no idea how to solve this question
8c=5c+21

Answers

Remember this rule: Whenever you try to isolate the variable do the same operation to both sides
Using the rule above subtract 5c from both sides getting 3c = 21
Divide by 3 to both sides
Now you have c = 7
Thats you answer, if you have anymore questions just PM me

Well, subtract 5c from both sides, so cross out 5c and do 8c-5c which is 3c. S 3c=21. 21 divided by 3 is 7. So c is. 7.

Please answer quick!The perimeter of a rectangular herb garden is 74 feet. If the length of the garden is 5 feet longer than 3 times its width, what is the garden's width?

Answers

Answer:

Step-by-step explanation:

Using perimeter =2(l+b)

74=2(L+B)

From the question

Width(b)=x & length(l)=3x+5

So we have that

74 =2(3x+5+x)

Adding like terms we then have that

74 =2(4x+5)

Opening the bracket gives

74=8x +10

Collecting like terms

8x=74-10

8x= 64

Therefore

X=64/8

X=8feets

The width is 8feets

Answer:

8 feet.

Step-by-step explanation:

plug into missing values

Increase 2850 by 18%

Answers

3363 it is. That is the answer. The problem would be "2850 + 18%" right. Because that's what I did.

Need help don’t understand it

Answers

ik half the answer it's y= -1/2x+y-intercept u have to find the y intercept

Mr warren drove from Townsville to villaville at 70 mph and back again at a speed of 50 mph. His total driving time was 12 hours. How far apart are the two towns

Answers

Call the distance between the towns 'D' .

The time it takes to cover a distance is (distance) divided by (speed).

It takes Mr. Warren D/70 hours on the first trip,
and it takes him D/50 hours on the return.
All together, it takes him 12 hours.

D/70 + D/50   = 12 hours

Change the fractions to
a common denominator
(350) for adding: 5D / 350 + 7D / 350 = 12

Add: 12D / 350   = 12

Divide each side by 12 :    D / 350   = 1

Multiply each side by 350 : D    = 350 miles .

Check:

Going: 350mi / 70 mph = 5 hours

Coming: 350mi / 50 mph = 7 hours

Total    12 hours    yay !

Warrendrove from Townsville à Villaville at 70 miles per hour
and from Villaville to Townsville è 50 milesper hours
He drove for a total of 12 hours.
=> 70 miles + 50 miles = 120 miles
=> 12 hours
So the unit rate of his driving is 120 miles / 12 hours
=> 120 miles / 12 hours
=> 10 miles / hour
thus, he drove in total for 10 miles per hour.
And probably the 2 towns are about 60 miles away.

X + y = -9
5x - 2y = 32

Answers

The solution is x = 2 and y = -11

Solution:

Given system of equations are:

x + y = -9 --------- eqn 1

5x - 2y = 32 ------------- eqn 2

We have to solve the system of equations

We can solve the system by substitution method

From eqn 1,

x + y = -9

Isolate "y" to one side

y = -9 - x ---------- eqn 3

Substitute eqn 3 in eqn 2

5x -2(-9 - x) = 32

5x + 18 + 2x = 32

Combine the like terms

7x = 32 - 18

7x = 14

x = 2

Substitute x = 2 in eqn 3

y = - 9 - 2

y = -11

Thus the solution is x = 2 and y = -11

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