Question

at the beginning of the day the stock market goes up 301/2 points. at the end of the day the stock market goes down 120 1/4 points. what is the total change in the stock market from the beginning of the day to the end of the day?

Answer 1

just saying

Explanation:

subtract them lol use a mixed number calculator online

Answer 2

let's change the mixed fractions first to improper fractions and then get their sum.

we don't know the beginning point of the market, however from that point on, it spikes up by 30½and then goes down by 120¼, we're being asked on the total change or namely the displacement, and that'd be the sum of the spike line going up and the dive line going down.

`\bf \stackrel{mixed}{30(1)/(2)}\implies \cfrac{30\cdot 2+1}{2}\implies \stackrel{improper}{\cfrac{61}{2}}~\hfill \stackrel{mixed}{120(1)/(4)}\implies \cfrac{120\cdot 4+1}{4}\implies \stackrel{improper}{\cfrac{481}{4}} \\\\[-0.35em] ~\dotfill\\\\ \cfrac{481}{4}+\cfrac{61}{2}\implies \stackrel{\textit{using an LCD of 4}}{\cfrac{(1)481+(2)61}{4}}\implies \cfrac{481+122}{4}\implies \cfrac{603}{4}\implies 150(3)/(4)`