Whats the rule? 0.5, 1.8, 3.1, 4.4

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

Akitchen is 12 ft. by 14 ft. with 10 ft. high walls. how much would it cost to put vinyl flooring in this room? $8.80 per ft

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3