Plz with question #6 and draw the graphs

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Ineed with number 6 , explain how to get 1978

The point a is at –2 and the point b is at 7. marissa would like to divide this line segment in a 4: 3 ratio, and she would like to use the formula x = (x2 – x1) + x1. what values should she substitute into the formula? a = a + b = x1 = x2 =