Please help me solve i have a few minutes before I have to submit this

question in image

What is the unit rate to: a 13-ounce package of pistachios costs $5.99.

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?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?