Really confusied dont do the last 2 at the bottom

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial

3. a sum of $2700 is to be given in the form of 63 prizes. if the prize is of either $100 or $25, find the number of prizes of each type.

What is the approximate value of  x  in the equation below.–3.396–0.7080.3040.955