Question

Write an equation to find the necessary score on the final exam for a student to earn an A (90%) in the class.

Answer 1

For the given table:

We will find the necessary score on the final exam for a student to earn an A (90%) in the class.

so,

The equation will be:

`92\cdot(0.2)+95\cdot(0.3)+88\cdot(0.2)+x\cdot(0.3)=90`

now, solve the equation to find x:

`\begin{gathered} 64.5+0.3x=90 \\ 0.3x=90-64.5 \\ 0.3x=25.5 \\ x=(25.5)/(0.3) \\ \\ x=85 \end{gathered}`

So, the answer will be:

The student needs a score of 85% on the final exam to earn a 90%