Twice a number decreased by 39 is five times the sum of the number and 2 times the number. Find the number.

You eat 8 strawberries and your friend eats 12 strawberries from a bowl. there are 20 strawberries left. which equation and solution give the original number of strawberries?

An air conditioning system can circulate 350 cubic feet of air per minute. how many cubic yards of air can it circulate per minute?

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).