How to add and subtract positive and negative fractions

Mathematics

2 answers:

Dvinal [7]3 years ago

5 0

Rules for adding: if the bases are the same you can add them, and subtracting happens in a fraction

Alenkinab [10]3 years ago

5 0

1. create a common denominator.
2. multiply the numerator by the same number . Next , you multiply the top numbers (numerators)by the same number as the denominators .
3. add (or subtract ) the numerators.
4. simplify if necessary.

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Find the surface area no links no pdfs just type it into the answer section will give brainliest

rewona [7]

Check the picture below.

let's firstly convert the mixed fractions to improper fractions.

$\stackrel{mixed}{7\frac{1}{2}}\implies \cfrac{7\cdot 2+1}{2}\implies \stackrel{improper}{\cfrac{15}{2}} ~\hfill \stackrel{mixed}{12\frac{1}{2}}\implies \cfrac{12\cdot 2+1}{2}\implies \stackrel{improper}{\cfrac{25}{2}} \\\\[-0.35em] ~\dotfill$

$\stackrel{\textit{\Large Areas}}{\stackrel{two~triangles}{2\left[ \cfrac{1}{2}\left(\cfrac{15}{2} \right)(10) \right]}~~ + ~~\stackrel{\textit{three rectangles}}{(10)(15)~~ + ~~\left( \cfrac{15}{2} \right)(15)~~ + ~~\left( \cfrac{25}{2} \right)(15)}} \\\\\\ 75~~ + ~~150~~ + ~~112.5~~ + ~~187.5\implies \boxed{525}$