Use an identity to find the value of the expression. Do not use a calculator.sec2 
- tan2 
A. - 
B. -1
C. 1
D. 
Answer: C
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Solve the problem.Find the great-circle distance between Leningrad, Russia ( latitude 60° north, longitude 30° east) and Wausau, Wisconsin (latitude 45° north, longitude 90° west).
A. ? 4480 mi B. ? 1480 mi C. ? 44,800 mi D. ? 448.5 mi
Write a sentence containing scientific notation for the answer.A company has 7 × 103 employees. In 2009, the company paid each employee 
per year. Multiply those two numbers to find the total amount the company paid in salaries.
A. The company paid $1.75 × 109 in salaries. B. The company paid $17.5 × 108 in salaries. C. The company paid $1.75 × 108 in salaries. D. The company paid $17.5 × 109 in salaries.
Perform the indicated operation.-76 ÷ (-4)
A. 
B. 19
C. 9
D. -19
Simplify the exponential expression.(x8y)2
A. x16y B. x16y2 C. x10y D. x10y3