PROBLEM 7\ Write the following sum in sigma notation.\

f(4y)+2*f(5y)+3*f(6y)+cdots+33*f(36y)+34*f(37y)

\ (Note that

f

is the name of a function, not a variable, so that for example

f(y)

is

f

evaluated at

y

,\ not

f

times

y

.)