Question

Please Help!!!

The average of your 3 quiz grades is 17 points. Two of your quiz grades are 14 points and 19 points. Write and solve an equation to find the third quiz grade.

Answer 1

the answer is 18. I had an equation of 17=14+19+g over 3. I divided the 14+19 by 3. then subtracted 10.96 from both sides of the equation. then all was left was 6=g÷3. I multiplied 3 to both sides. 18= the grade. 18+14+19=51 51÷3=17.

Answer 2

The third quiz grade is 18 points.

Explanation:

It is given that the average of 3 quiz grades is 17 points.

First quiz grade = 14

Second quiz grade = 19

Let x be the third quiz grades.

Average formula:

`Average=(\sum x)/(n)`

Average of three quiz grade is

`Average=(14+19+x)/(3)`

`17=(14+19+x)/(3)`

`17=(33+x)/(3)`

Multiply both sides by 3.

`17* 3=33+x`

`51=33+x`

Subtract 33 from both sides.

`51-33=x`

`18=x`

Therefore the third quiz grade is 18 points.