Incorrect. Because the problem says "varies directly," the equation to use is $\displaystyle{y}={k}{x}\usepackage{cmbright}\Huge\$ , where y is the cost and x is the number of days. Solve $\displaystyle{625}={k}{\left({5}\right)}\usepackage{cmbright}\Huge\$ for k. Then use this value of k and the values in the table for x in a new direct variation equation to find the missing table values.