Write the expression as the sine or cosine of an angle: sin π/7 cos x + cos π/7 sin x

Hint: sin(A +- B) = sin A cos B +- cos A sin B
cos (A +- B) = cos A cos B -+ sin A sin B

Which graph represents the following piecewise defined function?

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3