Question

Hey need this ASAP I’ve work through almost just need this one

Answer 1

He must score an 86 or more on his third test.

Explanation:

An average is calculated by the sum of the numbers divided by the total number (#) of numbers (if that makes sense). Knowing this, we can write an algebraic equation in order to find the answer. Let x equal the unknown number.

John's previous test scores and this test score now must be at least an average of 90 or more. Therefore, the equation would be
`(86+98+x)/(3) \geq 90`. Isolate x to find the answer:

`(86+98+x)/(3)\geq 90\\ (184+x)/(3) \geq 90\\184 + x \geq 270\\x \geq 86`

Therefore, he needs to get at least a 86 or higher.