Solve the problem.The cost of manufacturing clocks is given by c = 100(n + 64)1/2, where c is the cost in dollars and n is the number produced. What is the cost when no clocks are produced?
A. $80
B. $6400
C. $100
D. $800
Answer: D
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Factor by any method.y2 - 81
A. (y - 9)(y - 9) B. (y + 81)(y - 81) C. (y + 9)(y - 9) D. (y2 + 9)(y2 - 9)
Determine the local extrema of the function.f(x, y) = x3 - 12x + y2
A. f(0, 0) = 0, minimum B. f(2, 0) = -16, minimum C. f(0, 2) = 4, maximum D. f(0, 0) = 0, maximum
Solve the problem.Strontium 90 decays at a constant rate of 2.44% per year. Therefore, the equation for the amount P of strontium 90 after t years is P = P0 e-0.0244t. How long will it take for 15 grams of strontium to decay to 5 grams? Round answer to 2 decimal places.
A. 40.50 years B. 45.03 years. C. 4.50 years D. 450.25 years
Find a decimal approximation for the fraction or mixed number, rounded to the given place value. 
; hundredths
A. 0.857 B. 0.86 C. 1.17 D. 0.85