<h2><u></u></h2><h2><u>Answer:</u></h2><h3 /><h3><u><em>$465</em></u></h3><h2 /><h2><u>Steps and explanation of why:</u></h2>
Ben works 7 hours installing 9 fixtures.
This tells us that h = 7, and f = 9. So, let's substitute h = 7 and f = 9 into the expression and evaluate:
<h2>Step 1:</h2>
<u>15h + 40f</u>
<h2>Step 2:</h2>
<u>= 15(7) + 40(9)</u>
<h2>Step 3:</h2>
<u>= 105 + 360</u>
<h2>Step 4:</h2>
<u>= $465</u>
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