please help with the ones i got wrong

this is all the info that was given

Briggs Excavation Company is planning an investment of $182,000 for a bulldozer. The bulidozer is expected to operate for 1,000 hours per year for five years. Customers Will be charged $115 per hour for bulldozer work. The bulldozer operator costs $26 per hour in wages and benefits. The bulidozer is axpected to require annual maintenance costing $10,000. The bullozer uses fuel that is expected to cost $34 per hour of bulidozer operation. Dresent Valub of an Annuitu af e1 at Cnmnnumet Interect a. Determine the equal annual net cash flows from operating the bulldozer. Use a minus sign to indicate cash outfiow]. Determine the equal annual net cash flows from operating the bulldozer. Use a minus sign to indicate cash outflows. b. Determine the net present value of the investment, assuming that the desired rate of return is 6%. Use the present value of an annuity of $1 table above. Round to the nearest dollar. If required, use the minus sign to indicate a negative net present value. c. Should Briggs Excavation invest in the bulldozer, based on this analysis? , because the bulldozer cost is the present value of the cash flows at the minimum desired rate of return of 6%. d. Determine the number of operating hours such that the present value of cash flows equals the amount to be invested. Round interim calculations and final answer to the nearest whole number. x hours