Find the GCF of -42, 21, 84

Is it true or false i’m trying to pass this test so i can leave school

Tomas used 3 1/3 cups of flour and now has 1 2/3cups left. which equation can he use to find f, the number of cups of flour he had to begin with? f+3 1/3=1 2/3 f-3 1/3=1 2/3 3 1/3f=1 2/3 f/3 1/3=1 2/3

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse