Why did paolo add 3(x+2) to itself and subtract 8 ?

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2

You have 17 cats that live in houses on your street, 24 dogs, 3 fish, and 4 hamsters. what percent of animals on your block are dogs?