The long division below shows the first term
of the quotient. Which polynomial should be subtracted from the dividend first?
Please help me

Suppose there is a simple index of three stocks, stock abc, stock xyz, and stock qrs. stock abc opens on day 1 with 4000 shares at $3.15 per share. stock xyz opens on day 1 with 5000 shares at $4.30 per share. stock qrs opens on day 1 with 6000 shares at $4.60 per share. the price of stock abc on day 8 begins at $3.50. the price of stock xyz on day 8 begins at $3.90. stock qrs opens on day 8 with a price of $4.50 per share. assume that each stock has the same number of shares that it opened with on day 1. what is the rate of change of this simple index over 1 week?

Anyone know? is appreciated! will mark brainliest if correct!

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)