Solve for the specified variable. Assume that the constants have values for which the equation has exactly one real-number solution.r = 
, for ?.
A. ? = 
B. ? = 
C. ? = 
D. ? = 2Ar2
Answer: B
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Solve the problem.Suppose a business can sell x gadgets for p = 250 - 0.01x dollars apiece, and it costs the business 
dollars to produce the x gadgets. Determine the production level and cost per gadget required to maximize profit.
A. 111 gadgets at $248.89 each B. 10,000 gadgets at $150.00 each C. 13,750 gadgets at $112.50 each D. 11,250 gadgets at $137.50 each
Solve.A recipe for brownies calls for 3
cups of flour. If you are only making a half-batch, how much flour would you need?
A. 3
cups
B. 1
cups
C. 6
cups
D. 1
cups
Find the book value after the given number of years, using the straight-line method. Round your answer to the nearest dollar.Find the book value at the end of 4 years.Cost:$30,700Estimated life:9 yearsEstimated scrap value:$3100
A. $24,567 B. $18,433 C. $12,267 D. $17,056
Fill in the digits for the given place values in the following whole number.The speed of light is approximately 29,979,250,000 centimeters per second. What digit tells the number of ten millions?
A. 5 B. 2 C. 9 D. 7