10, 4. -2, -8 in an explicit formula

16 - 6n

Step-by-step explanation:

10 , 4 , -2 , - 8

This is arithmetic sequence

first term = 10

Common difference = 2nd term - first term

                          d    = 4 - 10

                            d = -6

nth term = a₁ + (n -1)d

              = 10 + (n - 1)*(-6)

             = 10 + n*(-6) - 1*(-6)

             = 10 - 6n + 6

             = 10 + 6 - 6n

             = 16 - 6n

a. she will receive a refund of $278.

step-by-step explanation:

there is no question content here, but you for the free points! : d