Double-angle and half-angle identiies [see attachment] question 4

We have

We already know so we have to find .

Theta is in the first quadrant so we choose the positive sign:

Choice c

$650 per month plus utilities

step-by-step explanation:

just based on the info you gave, it would seem more cost effective to rent at $650 per month plus utilities.   if utilities are, in fact, $150 per month, your monthly living costs would be $800 as opposed to the other option of $825.