Answer
The cost of renting the piece of machinery for 8 hours is $\$42$.
Work Step by Step
To find the cost of renting the machinery for 8 hours, substitute 8 to x in the given function to have:
$\\\\C(8)=4(8)+10
\\C(8)=32+10
\\C(8)=42$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.