Write a general formula to describe the variation.The illumination I produced on a surface by a source of light varies directly as the candlepower c of the source and inversely as the square of the distance d between the source and the surface.
A. I = 
B. I = 
C. I = 
D. I = kcd2
Answer: A
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Solve the problem.Anne and Nancy use a metal alloy that is 20% copper to make jewelry. How many ounces of a 14% alloy and a 24% alloy must be mixed to form 100 ounces of the desired alloy?
A. 40 at 14% and 60 at 24% B. 70 at 14% and 30 at 24% C. 30 at 14% and 70 at 24% D. 60 at 14% and 40 at 24%
Use an annuity table to find the periodic payment that will render the sum. Round to the nearest cent.S = $22,000, interest is 9% compounded monthly, payments made at the end of each month for 3 years
A. $1758.93 B. $93.17 C. $534.59 D. $1092.31
Find the circumference and area of a circle having the given diameter or radius. Use 3.14 for ?. Round your results to the nearest tenth.d = 15 cm
A. C ? 23.6 cm, A ? 94.2 cm2 B. C ? 47.1 cm, A ? 176.6 cm2 C. C ? 23.6 cm, A ? 706.5 cm2 D. C ? 47.1 cm, A ? 47.1 cm2
Solve the problem.A die is rolled 10 times. Find the probability of rolling no more than 3 ones.
A. Approximately .930 B. Approximately .155 C. Approximately .054 D. Approximately .775