Answer:
u gotta know how to do this my guy
Explanation:
ok so if $4.35 is equal to 3 days, and we want to spend NO MORE than $15, the first step is to divide 15 by 4.35, this answer will be x. ROUND YOUR ANSWER, NO DECIMALS. when you do this, your ending value, has to be y.
use x (the quotient from before) to multiply by 3 (the number of days an ad can run for) to find how many total days the ad can run for.
your answer will be an exact number or an inequality (<, >) depending on what your answer/problem requires.
lmk if u need more help :D