Y = -2, 3y-4 evaluate it please

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left