URGENT PLS HELP DONT TAKE ADVANTAGE OF THE BIG AMOUNT OF POINTS PLS you only have to do 14, 16 and 18

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

Which points are solutions to the linear inequality y < 0.5x + 2? check all that apply. (–3, –2) (–2, 1) (–1, –2) (–1, 2) (1, –2) (1, 2)

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.