Give the domain for f(x) in interval notation

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?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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