You scored 88, 92, and 87 on three tests. write and solve an equation to find the score you need on the fourth test so that your mean test score is 90.

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Set up the equation to find the average (mean) of four test scores:

88+92+87 + x

          4

We set this equal to the desired average (90) and solve for x.

88+92+87 + x

= 90, or 88+92+87+x = 360.  Next, 267 + x = 360.

          4

Subtracting 267 from both sides, we get x = 93.

Earning a 93 on the last test will result in an overall test score of 90.

5x + 5

step-by-step explanation:

you should always add the diagrams and graphs we cannot see. this particular question is kind of borderline because we can make a graph for you.

(f + g)x = -x^2 +3x + 5 + x^2 + 2x

(f + g)x = 5x + 5

the graph of z = 5x + 5 is shown below. always use desmos when in doubt.