Use the appropriate sum or difference identity to write the given expression as a function of x alone.cos (90° + x)

A. cos x
B. -sin x
C. -cos x
D. sin x

Answer: B

Mathematics

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Solve the problem.The sum of the percentages 31.542%, 17.467%, 22.42%, 12.861%, and 15.71% is 100.000%. Adjust the list so that there are no fractional parts. The following table shows the numbers truncated and the discarded portions.

A. 31%, 17%, 22%, 13%, 15% B. 31%, 17%, 22%, 12%, 16% C. 32%, 17%, 22%, 13%, 16% D. 32%, 18%, 22%, 13%, 16%

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Mathematics

Solve the problem.A piece of land is shaped like a right triangle. Two people start at the right angle of the triangle at the same time, and walk at the same speed along different legs of the triangle. If the area formed by the positions of the two people and their starting point (the right angle) is changing at then how fast are the people moving when they are from the right angle? (Round your answer to two decimal places.)