Sam scored 59, 64, and 68 on three test. how many points should he get on the fourth test to get an average score of 70?

a. 63.67 points
b. 65.25 points
c. 75 points
d. 89 points

The correct answer would be (D - 89 points)
59+64+68
=191 + 89
=280/4
=70(%)

You move the constant to the right side and change its sign to be 9z= -6 -8. that’s the first step.the second step would be calculate the difference of -8-6 to get -14. you equation should now be 9z=-14the last step is to divide both sides by 9 to get z=-14/9hope this