if y varies directly as x and the constant of variation is -3 which equation represents this relationship

Plz.yesterday, the snow was 2 feet deep in front of archie’s house. today, the snow depth dropped to 1.6 feet because the day is so warm. what is the percent change in the depth of the snow?

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585

What is the sum of these mixed numbers 4 2/3+ 3 1/9