This is a problem that could be solved with proportions. Here's how to set it up.
210mi./9 gallons =413mi./x gallons
Then, you would cross multiply 9x413 then divide that my 210. The result would be the X gallons. Good Luck ♡
To find the derivative, you must use the chain rule.
If u=x^3+2x:
dy/dx=(dy/du)(du/dx)
dy/du=d/du(e^u)=e^u=e^(x^3 + 2x)
du/dx =d/dx (x^3+2x) = 3x^2 + 2
So dy/dx=
e^(x^3+2x) * (3x^2+ 2)
15x = 292.50
Divide 15 from both sides
X= 5.85
1 T-shirt = $5.85
45x = 747.50
Divide 45 from both sides
X= 16.61
1 T-shirt = $ 16.61
