What are all the common factors of 36 and 56?

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.