Y is inversely proportional to x

when y=7, x=9

a) work out an equation connecting y and x

b) work out the value of y when x=21

Alex flies airplanes. His plane ascends 100 feet above the ground level in 20 seconds. What is the rate of the ascension in feet per second?

Max buys 25 books at the rate of $ 252.55 per book. How much did he spend?

Dwayne misses 12% of his foul shots and Bryan misses 0.2 of his foul shots. Write 12% and 0.2 as fractions in simplest form. Then compare the fractions to determine who misses more foul shots

Is - 6 rational or irrational

Emily wants a new Coach bag that is ticketed at $245. The bag is subject to 7.5% sales tax, and Emily has $260. Does she have enough money?

The maximum weight an airline allows for a suitcase is 50 pounds. Ella's suitcase weighs 8 pounds empty. If Ella meets the requirements, what could be the weight of the contents of her suitcase?

A flight instructor charges $50 per lesson, plus an additional fee for the use of his plane. The charge for the use of the plane varies directly with the square root of the time the plane is used.

What is an estimate of the value of 0.0000000055 as a product of a single digit and a power of 10?

How do you solve (a-1) - (a+2) - (a-3) = a

Which expression has a value of 7? a.[ (29-18) + (17+8) ] divide by 6 b. [ (29-18) + (17-8) ] divided by 4 c. [ (29+18) - (17+8) ] divided by 2 d. [ (29+18) + (17-8) ] divided by 8