Which strategy can be used to multiply 6 x 198 mentally?

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?

Extra points! find the missing dimension! need asap

Which of the following represents the factorization of the trinomial below? x^2+7x-30