Multiply or divide as indicated. Make sure that your answer is reasonable by estimating first. 46.8 ÷ 5
A. 0.936
B. 93.6
C. 0.107
D. 9.36
Answer: D
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Eliminate the parameter t. Find a rectangular equation for the plane curve defined by the parametric equations.x = 
, y = 2t + 3; 0 ? t ? 4
A. y = -3x2 + 17; 0 ? x ? 2 B. y = 2x2 + 3; 0 ? x ? 2 C. y = -3x + 17; 0 ? x ? 2 D. y = 3x2 + 2; -1 ? x ? 2
Simplify. Assume that all variables represent positive real numbers.11
- 2x
A. 9x
B. 13
C. 11
- 2x
D. 9x
Graph the function.y = 3 sec 
A. 
B. 
C. 
D. 
Solve the problem.The function A = A0e-0.01155x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 500 pounds of the material are placed in the vault, how much time will need to pass for only 140 pounds to remain?
A. 220 years B. 120 years C. 110 years D. 115 years