How do you rearrange y=a-x to make x the subject of the formula

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?