If a ⊂ b, b may have more elements than a. true false

That's true. If A is a subset of B, it means that every element in A is also an element in B. This means that B has, at least, as many elements as A. Nothing prevents B from having more elements though, which don't belong to A.

Consider this example:

A is a subset of B, because every element of A (1,2,3,4) is also an element of B (1,2,3,4 are in B as well).

Still, B has two more elements (5,6) which don't belong to A, so a superset can have (and typically does actually) more elements than its subset.

It will fit because the height is 3 1/4 ft.

Step-by-step explanation:

Divide the area 15 7/16 by the width, 4 3/4

15 7/16 ÷ 4 3/4   Change to decimals 15.4375/4.75 or

change to improper fraction 247/16 ÷ 19/4 . invert the divisor and multiply:

247/16 × 4/19  becomes 247/4 × 1/19

247/19 = 13   13/4 = 3 1/4