How do i convert 1.15 to a fraction in the lowest terms?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2

Grandpa ernie is shrinking! over the past 4 years his height decreased by a total of 2.4 cm.it decreased by the same amount each year. what was the change in grandpa ernie's height each year

Extremely mega ultra important question! plss answer as fast as you can you will get 84 points! the area of this right triangle is half the area of which of these rectangles?