How do you do this? I don’t understand it

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest