Gavins mean score on 3 math tests is 87. what equation can be solves to find x the score he needs on his test to bring his mean score up to 90

Step-by-step explanation:

Let x be the score on 4th test.

We have been given that Gavin's mean score on 3 math tests is 87.

Since we know that average is the sum divided by the count.

Let us find sum of scores on 3 math tests by multiplying 87 by 3.

Since Gavin needs the mean score on his 4 tests to be 90. This means score on 3 tests plus x divided by 4 will be equal to 90.

Therefore, the equation can be solved to find the score that Gavin needs on his test to bring his mean score up to 90.

3/5

step-by-step explanation:

double number line is not a standard concept, so it must have been defined in your textbook. assume top line is numerator.

just sum

10 + 10 = 20