Solve the problem.A surveyor standing 70 meters from the base of a building measures the angle to the top of the building and finds it to be 39°. The surveyor then measures the angle to the top of the radio tower on the building and finds that it is 48°. How tall is the radio tower?
A. 7.56 meters
B. 11.09 meters
C. 7.97 meters
D. 21.06 meters
Answer: D
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Solve the problem.Assume that the profit generated by a product is given by 
where x is the number of units sold. If the profit keeps changing at a rate of 
per month, then how fast are the sales changing when the number of units sold is 800? (Round your answer to the nearest dollar per month.)
A. $2121/month B. $67,882/month C. $4243/month D. $5/month
Solve and check.x + 7 = 20
A. x = 27 B. x = 12 C. x = 140 D. x = 13
Eliminate the parameter t. Find a rectangular equation for the plane curve defined by the parametric equations.x = 2 + sec t, y = 5 + 2 tan t; 0 < t < 
A. (x - 2)2 + 
= 1; 1 ? x ? 3
B. (y - 2)2 - 
= 1; -? < x < ?
C. (x - 2)2 - 
= 1; x > 3
D. (x - 2)2 - (y - 5)2 = 4; -? < x < ?
Find the quotient.
÷ 
A. 
B. - 
C. - 
D. 