Mathematics: Show work Plss oooooooo

Show work Plss oooooooo - id10973503, Tokkey12

Ответ:

cj9508

02.04.2022

22.5 mins

Step-by-step explanation:

To find what that video's length must be, subtract the previous videos' lengths from the requirement, 5 hours. (x is the video length of her fourth video)

7/8 + 1 1/4 + 2 1/2 + x = 5

To make adding these fractions easier, find a common denominator.

7/8 + 1 2/8 + 2 4/8 + x = 5

4 5/8 + x = 5

x = 3/8, or 22.5 minutes.

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Ответ:

melinalange48

02.04.2022

Mathematics

$\frac{3}{8} \text{ hours.}$

Step-by-step explanation:

Her first three videos totalled up to

$\frac{7}{8} + 1\frac{1}{4} + 2\frac{1}{2}\\=\frac{7}{8} + \frac{5}{4} + \frac{5}{2}\\=\frac{7}{8} + \frac{5}{4} \cdot \frac{2}{2} + \frac{5}{2} \cdot \frac{4}{4}\\=\frac{7}{8} + \frac{10}{8} + \frac{20}{8}\\=\frac{7+10+20}{8}\\=\frac{37}{8}$ hours. To meet the $5 = \frac{40}{8}$ hour goal the shortest fouth video she can make is $\frac{40}{8} - \frac{37}{8} = \frac{3}{8}$ hours, because if the fourth video was any shorter, she'd end up with less than $\frac{37}{8} + \frac{3}{8} = \frac{40}{8} = 5$ hours in total (this is called a proof by contradiction). We are now done.