Answer:
yes ur right
Step-by-step explanation:
Answer:
26
Step-by-step explanation:
20-7= 13 (half his comics) 13+13=26
We are given
The average income, I, in dollars is
![I=-425x^2+45500x-650000](https://tex.z-dn.net/?f=I%3D-425x%5E2%2B45500x-650000)
(a)
now, we are given
average income is $275000
so, ![I=275000](https://tex.z-dn.net/?f=I%3D275000)
now, we can set them equal
and then we can solve for x
![275000=-425x^2+45500x-650000](https://tex.z-dn.net/?f=275000%3D-425x%5E2%2B45500x-650000)
![-425x^2+45500x-925000=0](https://tex.z-dn.net/?f=-425x%5E2%2B45500x-925000%3D0)
we will have to use quadratic formula
![x=\frac{-45500+\sqrt{45500^2-4\left(-425\right)\left(-925000\right)}}{2\left(-425\right)}:\quad \frac{-\sqrt{45500^2-1572500000}+45500}{850}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-45500%2B%5Csqrt%7B45500%5E2-4%5Cleft%28-425%5Cright%29%5Cleft%28-925000%5Cright%29%7D%7D%7B2%5Cleft%28-425%5Cright%29%7D%3A%5Cquad%20%5Cfrac%7B-%5Csqrt%7B45500%5E2-1572500000%7D%2B45500%7D%7B850%7D)
![x=\frac{-45500-\sqrt{45500^2-4\left(-425\right)\left(-925000\right)}}{2\left(-425\right)}:\quad \frac{\sqrt{45500^2-1572500000}+45500}{850}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-45500-%5Csqrt%7B45500%5E2-4%5Cleft%28-425%5Cright%29%5Cleft%28-925000%5Cright%29%7D%7D%7B2%5Cleft%28-425%5Cright%29%7D%3A%5Cquad%20%5Cfrac%7B%5Csqrt%7B45500%5E2-1572500000%7D%2B45500%7D%7B850%7D)
we get
![x=27.28199](https://tex.z-dn.net/?f=x%3D27.28199)
![x=79.776](https://tex.z-dn.net/?f=x%3D79.776)
we need to find youngest age
It means that we need to choose smallest value
so,
............Answer
(b)
we are given
x=40
so, we can plug it and find I
![I=-425(40)^2+45500(40)-650000](https://tex.z-dn.net/?f=I%3D-425%2840%29%5E2%2B45500%2840%29-650000)
..............Answer
Answer:
15
Step-by-step explanation
We divide the amount he's selling them for, by the amount of money he needs to make.
75 divided by 5 equals 15.
He needs to sell 15 sports drinks to make $75.