The answer is c not D you are welcome
Step-by-step explanation:
X(x+6) - 6(x+6)
X+6x-6x-36
X-36
There is only one solution since x=0 x cant be many things since the only thing that would make this true is 0
So we know that an average is the sum of the scores divided by the number of scores that were added together. In this case we are going to be dealing with 4 tests. So let's say x is the score for our fourth test. We can create this equation:

So then we need to simplify the top:

Then multiply by 4 on both sides to get rid of the denominator:

Then solve for x:

So now we know that Sam needs to score a 67 on the fourth test to have an average score of 50.