Question

Hi i need help with this problem, its due Monday

A rectangle has an area of 21x + 81 square units. If the width is 3 units, what is the length of the rectangle?
A. 18x + 78 units
B. 7x + 27 units
C. 7x + 81 units
D. 21x + 27 units

Answer 1

The answer is B. 7x + 27 units.

Area is length multiplied by width, so to find the length, simply divide the expression 21x + 81 by the width --> 3.

21x becomes 7x, and 81 becomes 27.