If S is the midpoint of RT, RS=5x+17, and ST=8x-31, find RS

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

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

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?