Assume that you sold x baseball cards. This means that you sold 4x movie posters. So if he made $840, then he got 8x dollars on the baseball cards and 4x*12=48x dollars on movie posters. Adding 8x and 48x should be 840. So 56x=480. This means that x=15. So if Brian made 48x dollars on movie posters, it's really 48*15=720. Therefore, Brian made $720 on the movie posters.
Answer:
The fourth one
Step-by-step explanation:
It has no repeating x's or y's
Answer:4540
Step-by-step explanation:
If <em>x</em> is the number of years from now, that means the <em>current</em> population is when x=0
Therefore, we plug this into the equation:
f(x) = 1200(0.8)^0 = 1200 elk at the park currently
Simplify - 2b^2 -2a +3b ( give me a sec i'm trying to evaluate now )
