Answer:
9 teenagers
Step-by-step explanation:
12/20 = x/15
180/20 = x
9 = x
-----------------------
9 teenagers would take to finish the large pizza in 15 mins
When adding fractions you need to get common denominators then you multiply too times bottom and then boom add and there you go
<span>(3x^2+3)(4+x^3)
=</span><span>12x^2 +3x^5 + 12 + 3x^3
= </span>3x^5 + 3x^3 + 12x^2 + 12
I think the answer is 12 because 3 times 4 is 12