91影视

If y varies directly as x and y = 12 when x = 4 find the equation that relates x and y.

The number of calories, c, burned varies directly with the amount of time, t, spent exercising. Arnold burned 312 calories in 65 minutes exercising.

鈸� Write the equation that relates c and t.

鈸� How many calories would he burn if he exercises for 90 minutes?

The distance a moving body travels, d, varies directly with time, t, it moves. A train travels 100 miles in 2 hours

鈸� Write the equation that relates d and t.

鈸� How many miles would it travel in 5 hours?

The distance that Brad travels varies directly with the time spent traveling. Brad travelled 660 miles in 12 hours,

鈸� Write the equation that relates the number of miles travelled to the time.

鈸� How many miles could Brad travel in 4 hours?

The weight of a liquid varies directly as its volume. A liquid that weighs 24 pounds has a volume of 4 gallons.

鈸� Write the equation that relates the weight to the volume.

鈸� If a liquid has volume 13 gallons, what is its weight?

The distance an object falls is directly proportional to the square of the time it falls. A ball falls 144 feet in 3 seconds.

鈸� Write the equation that relates the distance to the time.

鈸� How far will an object fall in 4 seconds?

The area of a circle varies directly as the square of the radius. A circular pizza with a radius of 6 inches has an area of 113.04 square inches.

鈸� Write the equation that relates the area to the radius.

鈸� What is the area of a pizza with a radius of 9 inches?

If p varies inversely with q and p = 30 when q = 12 find the equation that relates p and q.

Simplify:$\frac{x^2+8x+7}{x^2-49}$

If y varies inversely with x and y = 8 when x = 2 find the equation that relates x and y .