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ch 8b review

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

How many solutions does the following have:
-(12x + 6) - 1 = -11x - (x + 7)
a.
one
c.
zero
b.
infinitely many
 

 2. 

How many solutions does the following have:
-(11x + 4) - 2 = -10x - (x + 15)
a.
one
c.
zero
b.
infinitely many
 

Numeric Response
 

 3. 

Solve for x:

y = –1
y =3x–6

(put answer in as integer or fraction)

 

 4. 

Solve for x:

x - y = 3
8x = 10 + 5y

(put answer in as integer or fraction)

 

 5. 

Solve for y:

x - y = 5
3x = 7 + 9y

(put answer in as integer or fraction)

 

 6. 

y = 4x + 8
6x + 4y = 12

What is the solution for x:
(put answer in as integer or fraction)

 

 7. 

_______________________________________________________________

Sam wants to join a gym.

Gym A: $45 joining fee and $15 Monthly charge.
Gym B: No joining fee and $30 Monthly charge.

Enter the number of months it will take for the total cost for both gyms to be equal.

 

 8. 

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The grape shows the relationship between the number of oil changes a car has per year and the average engine repair cost in a year for a sample popuilation.


nr008-1.jpg
                              Number of Oil changes Per Year

The y-intercept of the estimated line of best fit is at (0,b) Enter the approximate value of b

 

 9. 

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The grape shows the relationship between the number of oil changes a car has per year and the average engine repair cost in a year for a sample popuilation.


nr009-1.jpg
                              Number of Oil changes Per Year

Enter the approximatee slope of the estimated line of best fit.
(put answer in as integer or fraction)

 

 10. 

7356------------------------------------------------------------------------------------------------------


All 8th grade students at a school answer Yes or No to the two survey question shown.

Have you ridden on a city bus in the last year?yesno
Have you taken a taxi in the last yearyesno

The same students responded to both questions. Find the number find the number A.

 
Yes Taxi
No Taxi
Total
Yes Bus
91
A
147
No Bus
73
33
C
Total
B
89
D

What is the value of A?

 

 11. 

7058------------------------------------------------------------------------------------------------------


All 8th grade students at a school answer Yes or No to the two survey question shown.

Have you ridden on a city bus in the last year?yesno
Have you taken a taxi in the last yearyesno

The same students responded to both questions. Find the number find the number B.

 
Yes Taxi
No Taxi
Total
Yes Bus
54
A
112
No Bus
70
32
C
Total
B
90
D

What is the value of B?

 

 12. 

5345------------------------------------------------------------------------------------------------------


All 8th grade students at a school answer Yes or No to the two survey question shown.

Have you ridden on a city bus in the last year?yesno
Have you taken a taxi in the last yearyesno

The same students responded to both questions. Find the number find the number B.

 
Yes Taxi
No Taxi
Total
Yes Bus
104
A
149
No Bus
53
41
C
Total
B
86
D

What is the value of C?

 



 
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