Answer
$P=24.6\frac{lb}{in^2}$
Work Step by Step
The actual pressure is
$P=P_{atm}+P_{gauge}$
We plug in the known values to obtain:
$P=14.7+9.9$
$P=24.6\frac{lb}{in^2}$
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.