The temperature dropped –4 °f on monday, –5 °f on tuesday, and –3 °f on wednesday. which equation correctly shows how to find the average drop in temperature for all three days?

You need to use the "mean". -4 + -3 + -5= -12 ÷ by 3 = -4°. the answer is -4

Sum i=1 to 12 of (3i-1):

2+5+...+35

12 terms; sum of first and last terms is 37.

Sum = (number of terms) times (average of all the terms)

For an arithmetic sequence, the average of all the terms is the average of the first and last terms:

Sum = (number of terms) times (average of first and last terms)