The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).x = -3
A. r sin ? = -3
B. r cos ? = -3
C. r sin ? = 3
D. r cos ? = 3
Answer: B
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Find 
and 
.f(x, y) = (6x5y3 - 6)2
A. 
= 60x4y3(6x5y3 - 6); 
= 36x5y2(6x5y3 - 6)
B. 
= 30x4y3; 
= 18x5y2
C. 
= 36x5y2(6x5y3 - 6); 
= 60x4y3(6x5y3 - 6)
D. 
= 2(6x5y3 - 6); 
= 2(6x5y3 - 6)
Solve the problem.A car on a test track described by x = 0.40t3, y = 19t - 1.7t2, where x and y are measured in meters and t is in seconds. Find the acceleration of the car at 
A. 5.1 m/s2, 340.5° B. 10 m/s2, 340.5° C. 10 m/s2, 160.5° D. 5.1 m/s2, 160.5°
Simplify the radical expression. Assume all variables represent positive real numbers.
A. 19 B. 7 C. ±7 D. 49
Solve the equation in part (a) graphically, expressing the solution to the nearest hundredth. Then, use the graph to solve the associated inequalities in parts (b) and (c), expressing endpoints to the nearest hundredth.(a) 
= 0; (b) 
> 0; (c) 
< 0
A. (a) {-7.47} (b) (-7.47, ?) (c) (-?, -7.47) B. (a) ? (b) (-?, ?) (c) ? C. (a) {-28.53} (b) (-28.53, ?) (c) (-?, -28.53) D. (a) {-28.53} (b) (-28.53, 0) ? (0, ?) (c) (-?, -28.53)