Write the phrase as a variable expression. Use x to represent "a number."Negative nine decreased by 3 times a number
A. -9 - 3x
B. 9 - 3x
C. -9 + 3x
D. 9 + 3x
Answer: A
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Find the arc length parameter along the curve from the point where t = 0 by evaluating 
r(t) = (1 + 5t)i + (1 + 8t)j + (4 - 4t)k
A. 4
t
B. 
t
C. 
t
D. 
t
Simplify the rational expression. If the rational expression cannot be simplified, so state.
A. - 
B. - 
C. - 
D. 
Solve the problem.In the following formula, y is the minimum number of hours of studying required to attain a test score of x: 
How many hours of study are needed to score 87? Round to the nearest hundredth if necessary.
A. 101.06 hr B. 6.03 hr C. 24.50 hr D. 2.45 hr
Solve the problem. Round your answer to the nearest cent.Brad invests $4100 in an account paying 6% compounded monthly. How much is in the account after 6 months?
A. $5815.93 B. $4110.24 C. $4224.55 D. $4221.21