Joseph purchased 150 hens each for Rs 50. Four hens died of a disease. He sold the remaining for Rs 51 each. Find his profit or loss percent​

The graph below shows the amount of money left in the school’s desk fund, f, after d desks have been purchased. for each new desk that is purchased, by how much does the amount of money left in the school’s desk fund decrease?

In the rectangle below ac=30 units what is de

What is the difference between the equations of a vertical and a horizontal line?