## Algebra 2 (1st Edition)

$t=5.1s$
If the variables vary directly, then $t=as$ for some constant $a$. $\frac{23}{4.5}\approx5.1$ $\frac{40}{7.8}\approx5.1$ $\frac{82}{16}\approx5.1$ Thus there is a direct variation with $a=5.1$, and the equation is: $t=5.1s$