Use the properties of the trigonometric functions to find the exact value of the expression. Do not use a calculator.sec2 50° - tan2 50°
A. 2
B. 1
C. -1
D. 0
Answer: B
Mathematics
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Given matrix A, find the indicated cofactor.Find A21.A = 
A. -11 B. -14 C. 11 D. 14
Mathematics
Use modular arithmetic to find the answer.Fill in the blank so that the answer is nonnegative and the least possible number.285 ? ___ (mod 11)
A. 11 B. 10 C. 6 D. 5
Mathematics
Solve the problem.The period, P, of a pendulum in seconds is given by the formula 
where L is the length of the pendulum. Find P when the value of L is 7 inches. Round your answer to the nearest hundredth. Use 3.14 for ?.
A. 2.47 seconds B. 2.94 seconds C. 1.47 seconds D. 3.94 seconds
Mathematics
Find the area of a circle with radius 2.5 feet. Round to the nearest tenth of a foot.
What will be an ideal response?
Mathematics