Question

Does anyone know how to do this? This looks familiar to me but I don’t know what to do.

Answer 1

Let us set x for the missing score.

Now, if he wants to keep an average of 86 or greater, we need to use the next inequality:

`(68+84+x)/(3)≥86`

Then, we need to solve for x:

`(152+x)/(3)≥86`

Multiply both sides by 3:

`\begin{gathered} (3)(152+x)/(3)≥(3)(86) \\ 152+x≥258 \end{gathered}`

Subtract both sides by 152:

`152-152+x≥258-152`

Simplify:

`x≥104`

In this case, the score is 104 is greater than the possible number of points.

Hence, enter DNE