In general,

Therefore, in our case,

<h2>The answer is 4x^5-16x^3+x^2-4. Select 4, 16, 1, 4 (left to right)</h2>
f(x) + g(x) = 5x - 3 - 2x + 7
= 3x + 4
Hope this helps! If you have any questions, feel free to ask.
The formula to that equation:
A(t)=p *e^rt
P is the principle amount invested 400
R is the rate, 0.09 T is the 3 years.
Solve from there.