Does anyone know how to do this

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

Identify the function that contains the data in the following table: x     -2         0         2         3         5     f(x)     5         3         1         2         4     possible answers: f(x) = |x| + 1 f(x) = |x - 2| f(x) = |x - 2| - 1 f(x) = |x - 2| + 1