Pls help.

Thank You So Much if you did!

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?

If 20% of a number is 35, what is 50% of that number?

To determine the number of deer in a forest a forest ranger tags 280 and releases them back