What is the retail price of something that cost $280 with a 75% mark up?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Write an equation for the function that includes the points (2,100)and (3,100)

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?