There where b balloons at the beginning of a party. By the end of the party, 3 of them had popped. using b, write an expression for the number of balloons that were left

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 =