Solve the problem.The owner of a video store has determined that the cost C, in dollars, of operating the store is approximately given by  where x is the number of videos rented daily. Find the lowest cost to the nearest dollar.

A. $418
B. $643
C. $305
D. $80

Answer: A

Mathematics

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Find the derivative of the function.r = (sec ? + tan ?)-6

A. -6(sec ? + tan ?)-7(tan2 ? + sec ? tan ?)
B. -6(sec ? tan ? + sec2?)-7
C.
D. -6(sec ? + tan ?)-7

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Mathematics

Solve the problem.A brick staircase has a total of 20 steps The first step requires 108 bricks. Each successive step requires 5 fewer bricks than the prior one. How many bricks are required to build the staircase?

A. 1210 bricks B. 2420 bricks C. 1160 bricks D. 3110 bricks

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Use half-angle identities to find the exact value of the expression.tan 75°

A. 2 + 
B. -2 + 
C. -2 - 
D. 2 - 

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Mathematics

Find, if possible, the whole number that makes the equation true. ÷ 2 = 0

A. 2 B. 0 C. No whole number D. 1

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Mathematics