Chapter 3 - Equations and Problem Solving - 3.1 - Solving First-Degree Equations - Problem Set 3.1 - Page 100: 76

$8=t$

We start with the given equation: $i=Prt$ We plug in the values for $i$, $P$, and $r$: $540=(750)(0.09)t$ We simplify the right side of the equation by multiplying: $540=67.5t$ We are trying to get $t$ by itself. In order to do so, we must divide by $67.5$ on each side of the equation and then simplify: $$\frac{540}{67.5}=\frac{67.5t}{67.5}$$$$8=t$$