A parallelogram has a perimeter of 88 inches, and 1 of its sides measures 18 inches. If it can be determined, what are the lengths, in inches, of the other 3 sides?

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We can check the answer choices to see which numbers add up to 88.

$$ 18 + 18+26 +26 = 88 \checkmark $$

The perimeter of a parallelogram is the sum of the four sides, where opposite sides are congruent.

$$ 2x+2y=88 $$ $$ 2(18)+2y=88 $$ $$ 36 + 2y =88 $$ $$ 2y=52 $$ $$ y= 26$$

The two sides are 18 and 26.