PROBABILITY!! Please help huge part of my grade will give BRAINLIEST or venmo you (only need the last 2)

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?

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?