Alguien podria explicarme como se realiza ese logaritmo?

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

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?