Evaluate.
A. 7
B. 2!
C. 
D. 42
Answer: D
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Solve the problem.A construction crane lifts a 100-lb bucket originally containing 155 lb of sand at a constant rate. The sand leaks out at a constant rate so that there is only 77.5 lb of sand left when the crane reaches a height of 60 feet. How much work is done by the crane?
A. 12,975 ft ? lb B. 2925 ft ? lb C. 15,300 ft ? lb D. 6975 ft ? lb
Find the reciprocal, if it exists.7.2
A. -7.2
B. No reciprocal
C. -6.2
D. 
Find the exact value under the given conditions.Given sin ? = - 
, with ? in quadrant IV, and tan ? = - 
, with ? in quadrant II. Find cos (? + ?).
A. 
B. - 
C. - 
D. 
Solve the problem.Two forces, F1 of magnitude 35 newtons (N) and F2 of magnitude 55 newtons, act on an object at angles of 
and 
(respectively) with the positive x-axis. Find the direction and magnitude of the resultant force; that is, find 
Round the direction and magnitude to two decimal places.
What will be an ideal response?