Dilation of f(x)=3x^2 +12x-15

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Which inequality has a dashed boundary line when graphed ?