Find the impulse response of the system described by 4y[n]-5y[n-1]+y[n-2]=x[n]

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

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?

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x