book Maths Puzzle Numerical Ability

If f(x,y) = x+2y what is

a.f(3,5)
b.f(5,3)
c.f(a,b)
d.f(b,a)

Read Solution (Total 0)

book Other Question

I am supposed to solve this problem by completing the square:
(x squared) + 11x + 10=0 Walt made an extra $10,000 last year from a part-time job. He invested part of the money at 6% and the rest at 9%. He made a total of $690 in interest. How much was invested at 9%?