Solve the problem.The intensity of a radio signal from the radio station varies inversely as the square of the distance from the station. Suppose the the intensity is 8000 units at a distance of 2 miles. What will the intensity be at a distance of 13 miles? Round your answer to the nearest unit.
A. 189 units
B. 153 units
C. 172 units
D. 215 units
Answer: A
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Solve.The distance D that a spring is stretched by a hanging object varies directly as the weight W of the object. If a 25-kg object stretches a spring 89 cm, find the distance the spring is stretched when the weight is 18-kg. Round to the nearest hundredth of a centimeter if necessary.
A. 64.08 cm B. 132 cm C. 5.06 cm D. 3.56 cm
There is to be a board meeting in the Success Unlimited Inc. boardroom. The chair of the board always sits at the head of the long rectangular table. There are three seats along each side of the table and one seat at the far end which no one ever uses. Six people should attend the meeting in addition to the chair. However, two people are out of town on assignment and a third person is ill. In how many different ways can the remaining people sit at the table?
What will be an ideal response?
Find the product.(8y2 - 10)(8y2 + 10)
A. 64y2 + 100 B. 64y4 - 100 C. 8y2 - 100 D. 64y4 - 160y2 + 160
Use trigonometric identities to solve each equation in the interval [0, 2?]sec2 x - 2 = tan2 x
A. 
B. 
C. 
D. ?