A successful author invests some of his earnings in two accounts for 1 year. the function f(x)=.05 models the interest he earns on x dollars invested in the first account. the function g(x)=.075(x+2500) models the interest he earns from the second account, in which he invests $2500 more than in the first account.
Evaluate (f+g)(18,500) and interpret what it means in this situation
+36916 f(x) = .05 x
g(x) = .075(x+2500)
f+g = .05x + .075 (x+2500)
.05x + .075x + 187.50
= .125 x + 187.50
f+g (18500) would represent the interest from an acccount with 18500 and from an account with 21000 in it ( BOTH accounts)
= .125 (18500) + 187.5
2312.50 + 187.50 = $ 2500
