Solve the problem.A radio transmission tower is 210 feet tall. How long should a guy wire be if it is to be attached 13 feet from the top and is to make an angle of 20° with the ground? Give your answer to the nearest tenth of a foot.
A. 209.6 ft
B. 614.0 ft
C. 223.5 ft
D. 576.0 ft
Answer: D
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Rewrite each number using scientific notation before performing the operation. Leave your answer in scientific notation form.3 × 10-35 + 5 × 10-34
A. 5.3 × 10-35 B. 5.3 × 10-33 C. 5.3 × 10-34 D. 8.0 × 10-34
Simplify the expression. 
? 
A. 
B. 
C. 
D. - 
A man is flying in a hot-air balloon in a straight line at a constant rate of 6 feet per second, while keeping it at a constant altitude. As he approaches the parking lot of a market, he notices that the angle of depression from his balloon to a friend's car in the parking lot is 36°. A minute and a half later, after flying directly over this friend's car, he looks back to see his friend getting into the car and observes the angle of depression to be 37°. At that time, what is the distance between him and his friend? (Give your answer to the nearest foot.) ? Distance = __________ ft
Fill in the blank(s) with the appropriate word(s).
Find the partial sum of the geometric sequence with the given first term and common ratio.s4, a1 = -5, r = 3
A. -65 B. - 200 C. - 40 D. 200