Find the distance between (4, -5) and (-4, -5) on the coordinate plane

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3

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

Alexandra drove from michigan to colorado to visit her friend. the speed limit on the highway is 70 miles per hour. if alexandra's combined driving time for the trip was 14 hours how many miles did alejandra drive?