Evaluate.
, when x = 21 and y = 63
A. 15
B. 294
C. 10
D. 42
Answer: D
You might also like to view...
Find all the numbers for which the rational expression is defined.
A. b ? 5 B. b ? -5 C. All real numbers. D. b ? 0
What part of the set of objects is shaded?
A. 
B. 
C. 
D. 
Solve the problem.A company manufactures two ballpoint pens, silver and gold. The silver requires 4 min in a grinder and 6 min in a bonder. The gold requires 5 min in a grinder and 7 min in a bonder. The grinder can be run no more than 53 hours per week and the bonder no more than 54 hours per week. The company makes a $3 profit on each silver pen sold and $12 on each gold. How many of each type should be made each week to maximize profits?
A. Silver pens: 462 Gold pens: 218 B. Silver pens: 1 Gold pens: 462 C. Silver pens: 0 Gold pens: 461 D. Silver pens: 218 Gold pens: 461
Solve.A construction worker tosses a scrap piece of lumber from the roof of a building. How long does it take the piece of lumber to reach the ground 81 feet below? Use the formula 
where d is the distance an object falls in feet and t is the time of the fall in seconds.
A. 
sec
B. 
sec
C. 5.0625 sec
D. 2.25 sec