1.Find all integers n>=1 such that
(n^3+3)/(n^2+7)is an intege
2.Find all integral values of x,y,z,w given
that x!+y!=2^z*3^w
3.Let f (x) be a linear function such that
f(0)=–5 and f(f(0)) =–15.
Find all values of m for which the solutions
of the inequality f(x)f(m–x)> 0 form an
interval of length 2.