Solve the problem.How long would it take to drive a distance of 25 miles if you drive at a constant speed of 58 miles per hour? Round your answer to the nearest hundredth if necessary.(Distance = Speed × Time)
A. 4.31 hr
B. 0.43 hr
C. 1450.0 hr
D. 2.32 hr
Answer: B
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Solve the problem.Suppose c(x) = x3 - 20x2 + 20,000x is the cost of manufacturing x items. Find a production level that will minimize the average cost of making x items.
A. 11 items B. 10 items C. 9 items D. 12 items
Solve the problem.A data set consists of 571 lightbulbs. Over a long period of time, the lifetimes of those lightbulbs have been tested. It has been found that the mean and standard deviation are known and the lifetimes of the bulbs are normally distributed. What number of bulbs within this data set will have lifetimes that lie within 2 standard deviations to either side of the mean? Round your answer to the nearest whole number.
A. 480 B. 272 C. 285 D. 545
Solve:
ÚÄÄÄ ÚÄÄÄ û-36 + û-81 = a. j15 b. -6 + j9 c. 6 - j9 d. 15 e. -15
Multiply the expressions.(12 - 5x)2
A. 25x2 + 144 B. -25x2 - 120x + 144 C. 25x2 + 120x + 144 D. 25x2 - 120x + 144