## Intermediate Algebra (6th Edition)

You are given the following: $x$ = number of encyclopedias $1.5x$ = total length of shelf needed in inches for $x$ encyclopedias You are asked to find the length of shelf space needed for a set of 30 encyclopedias. Therefore, $x=30$. Since you have an expression to find the length of shelf space needed for $x$ encyclopedias, and you know that $x=30$, plug that value into the expression: $1.5(30)$ And solve: $1.5\times30=45$ And remember to include your unit, which in this case is inches.