Simplify the expression by combining like terms.7a - 2a - a - 13
A. 5a - 13
B. 5a - a - 13
C. 5a - 14
D. 4a - 13
Answer: D
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Solve.Erika spent 
hr on her computer visiting the history channel and the discovery channel websites. She spent 
hr at the history channel website. How many hours did she spend at the discovery channel website?
A. 
hr
B. 
hr
C. 
hr
D. 
hr
Solve the problem. Round to the nearest tenth, if necessaryThe part is 1.5 and the whole is 5.25. Find the percent.
A. 14.3% B. 28.6% C. 350% D. 2.9%
Translate the sentence to an equation using x as the variable. Do not solve the equation.six more than a number is equal to sixteen.
A. 6 - x = 16 B. x = 16 + 6 C. x - 6 = 16 D. x + 6 = 16
Solve the problem.The volume of a rectangular box with square base and a height of 5 feet is V(x) = 5x2, where x is the length of a side of the base. Find the instantaneous rate of change of volume with respect to x when x = 3 feet.
A. 45 ft3/ft B. 30 ft3/ft C. 15 ft3/ft D. 6 ft3/ft