Direct Variation

Front

If c varies directly as the square root of d, and c = 14 when d = 64, find c when d = 324.

Back

63/2

Front

Direct variation equation if y = 8 and x = 4?

Back

y=2x

Front

Direct variation equation if y = –5 and x = 7?

Back

y=-(5/7)x

Front

Suppose y varies directly with x, and when y is 16, x is 8. Find y when x is 16.

Back

32

Front

Suppose y varies directly with x, and when y is 2, x is 3. Find x when y is 42.

Back

63

Front

Does the equation 2x = y represent a direct variation?

Back

True

Front

v varies directly with t; v = 16 when t = 2. Options: v = kt, v = k/t, v = 8t, v = 8/t

Back

v = 8t

Front

The distance required to stop a car varies directly as the square of its speed. If 250 feet are required to stop a car traveling 60 miles per hour, how many feet are required to stop a car traveling 96 miles per hour?

Back

640 feet

Front

Your distance from a lightning bolt varies directly with the time it takes you to hear thunder. If you hear thunder 10 seconds after you see the lightning, you are about 2 miles from the lightning. How many seconds will it take for the thunder to travel a distance of 4 miles?

Back

30 seconds