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# module 4

If y varies directly as​ x, find the constant of variation k and the direct variation equation for the situation. y equals=7 when x equals=21 k=1/3 y=1/3x
The weight of a synthetic ball varies directly with the cube of its radius. A ball with a radius of 2 inches weighs 3.20 pounds. Find the weight of a ball of the same material with a​ 3-inch radius. 10.80 lb
If the voltage V in an electric circuit is held​ constant, the current I is inversely proportional to the resistance R. If the current is 40 amperes when the resistance is 240 ohms, find the current when the resistance is 150 ohms. 64 amperes
Write the statement as an equation. Use k as the constant of variation. g varies jointly as m and s. g=kms
For the​ statement, find the constant of variation and the variation equation y varies jointly as x and the cube of​ z; y equals=64 when x equals=2 and z equals=2 k=4 y=4xz^3
Write an equation to describe the variation. Use k for the constant of proportionality. y varies directly as t and inversely as p^4 kt/p^4
Write an equation to describe the variation. Use k for the constant of proportionality. n varies inversely as e^2 n=k/e^2
The intensity of light​ (in foot-candles) varies inversely as the square of​ x, distance in feet from light source. The intensity of light 33 ft from the source is 36 ​foot-candles. How far away is the source if the intensity of light is 4 ​ft candles? 9 feet
The volume of a cone varies jointly as the square of its radius and its height. If volume of a cone is 12π cubic inches when the radius is 2 inches and height is 9 inches, find volume of a cone when the radius is 33 inches and the height is 6 in. the volume is 18π in.^3
For the​ statement, find the constant of variation and the variation equation. y varies jointly as x and the cube of​ z; y=729 when x=9 and z=3 k=3 y=3xz^3
Created by: lrutkowske