I have a calculus packet to do over the summer. I did as much as i could but i really didn't know how to do a few questions.

1. Find a formula for the function f graphed below

(theres a graph with the points (0,0)(1,1)(2,0)(3,0)(4,0)(5,0)

2. Let f and g be odd functions. If p,r, and s are nonzero functions defined as follows, which must be odd?

I. p(x)=f(g(x)) II. r(x)=f(x)+g(x) III. s(x)=f(x)*g(x)

(A) I only; (B) II only; (C) I and II only; (D) II and III only; (E) I, II, and III

3. The graphs of f and g are shown below and h=f º g. Estimate the value of h(0.5). Then sketch the value of h

Any help is greatly appreciated