Use a commutative property to complete the statement.-13 ? x = 
A. x - (13)
B. 13 - x
C. 13 ? x
D. x ? (-13)
Answer: D
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Subtract and simplify. Write the answer as a mixed number as needed.20
- 
A. 18
B. 19
C. 19
D. 20
Solve the problem.At the start of a chemistry experiment, Sarah measured the temperature of a liquid to be 
At the end of the experiment, it had risen 
What was the liquid's temperature at the end of the experiment?
A. 50°C B. 16°C C. -50°C D. -16°C
Solve.The pitch of a screw is the distance between threads. With each complete rotation of the screw, it goes in or out a distance equal to its pitch. How far will a screw with a pitch of 
in. go into a piece of wood when it is turned 10 complete rotations clockwise?
A. 
in.
B. 
in.
C. 
in.
D. 
in.
Find the foci of the ellipse.49x2 + y2 - 392x + 735 = 0
A. (4, 4
), (4, -4
)
B. (4 + 4
, 0), (4 -4
, 0)
C. (7, 
), (7, -
)
D. (4, 7), (4, -7)