Question

The table below shows the changes in the value of a company's stock over the past four weeks. By how many points would the stock value need to change in Week 5 to return to its value before Week 1? Explain.

Answer 1

+ 4 7/8

Explanation:

Assuming that we start in week 0, with a total of 0 points, we must operate the changes in each week and the value opposite to that result must be the change necessary to return to the original value.

Just like that:

`\begin{gathered} 9(1)/(2)+6(5)/(8)-12(3)/(4)-8(1)/(4)=(19)/(2)+(53)/(8)-(51)/(4)-(33)/(4)=-(39)/(8)=-4(7)/(8) \\ -4(7)/(8)+4(7)/(8)=0 \end{gathered}`

Which means that to return to the initial value, 4 7/8 points must be added