Which pair of numbers is relatively prime?

a.
21 and 39

b.
10 and 21

c.
12 and 54

d.
15 and 27

Diana is painting statues she has 7/8 of a liter of paint each statue requires 1/20 of a liter of paint how many statues can she paint?

An equation where variables are used to represent known values—function notation true or false

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled