If the mean of a set of numbers is 12, what must the last one be if the first
ones are 7, 16, 11, 12, and 10? *

16

Step-by-step explanation:

The mean is all the numbers i the set added together, then divided by the number of terms. For example:

1 2 3

1+2+3

6

6/3=2

2 would be the mean.

So:

16 is the missing value of the set if the mean is 12.

Finito.

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8