What is the midpoint of AB need help?

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

What is the probably of getting heads when poing a coin and getting a number greater than or equal to 5 when rolling a single diea) 1/6b) 1/3c) 1/4d) 1/12

£100.80 divided by 14 equals 7.2 how would we put this as money