Astudent has gotten the following grades on his tests. what is the minimum grade he must get on the last test in order to have an average of 84?
76, 93, 89, 71
the minimum grade he must get on the last test in order to have an average of 84 is x
what is x?

91

Step-by-step explanation:

I used a calculator and if you add 76, 93, 89, 71 to 91 it equals 420 and if you divide that by 5 it is 84.

Hope this helps!

The answer to this problem is A and here’s why:

If you look at the bottom part of the graph, which is the x-axis, you can see that it only goes up to 10 minutes, so that automatically eliminates choices B and C, and we can see that at 9 minutes, the y-axis of that line is at 80 meters, so that means that A is the answer.