Solve the problem.The time it takes to complete a certain job varies inversely to the number of people working on that job. If it takes 20 hours for 13 carpenters to frame a house, then how long will it take 25 carpenters to do the same job?

A. 25 hr
B. 10.4 hr
C. 16.3 hr
D. 40 hr


Answer: B

Mathematics

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The height H, in feet, of the winning pole value in the early years of the Olympic games can be modeled by ?   ? where t is years since 1900. Use functional notation to express what the height of the winning pole vault would have been in 1928.00. Then calculate that value. ?

A. Functional notation: . Value is 303.40 feet.
B. Functional notation: . Value is 20880.40 feet.
C. Functional notation: . Value is 15.31 feet.
D. Functional notation: . Value is  319.31 feet.

Mathematics

Use formulas for perimeter and area to solve the problem.A window consists of a rectangle and a semicircle (half a circle). The dimensions of the rectangle are 8 ft by 3 ft. Find the area of the window. If necessary, use 3.14 for ? and round the result to the nearest tenth.3 ft

A. 14.5 ft2 B. 38.1 ft2 C. 52.3 ft2 D. 26.4 ft2

Mathematics

Determine whether the equation represents direct, inverse, joint, or combined variation.y = 4x2

A. Joint B. Direct C. Inverse D. Combined

Mathematics

Find the domain.f(x) = 

A. {x|x ? 13} or [13, ?) B. {x|x ? 13} or (-?, 13] C. All real numbers or (-?, ?) D. {x|x ? -13} or (-?, -13]

Mathematics