Answer
The graph is a straight line in all windows. Parentheses must be used to ensure that $x$ is in the exponent.
Work Step by Step
When the function is entered as $y=1.04^{5x}$, is interpreted as $y=\left(1.04^5\right)^x=1.217^x$, which is an exponential.
Your friend entered $y=1.04^5\cdot x\approx 1.217x$. This graph is a straight line in all windows. Parentheses must be used to ensure that $x$ is in the exponent.
