explain how to do this

Find the balance at the end of 4 years if 1000 is deposited at the rate of

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39

Can some one explain this i got sent this. is this a threat i’m scared