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anonymous 5 years ago trying to figure out how to solve this problem 2/5 + 7/10 x -3/2 + 4/15

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1. anonymous

$\frac{2}{5} + \frac{7}{10} * \frac{-3}{2} + \frac{4}{15}$ Find the lowest common denominator (LCD), which happens to be 30 $\frac{12}{30} + \frac{21}{30} * \frac{-45}{30} + \frac{8}{30}$

2. anonymous

Oh crap, scratch that $\frac{2}{5} + \frac{-21}{20} + \frac{4}{15}$

3. anonymous

The LCD is 60, so $\frac{24}{60} + \frac{-63}{60} + \frac{16}{60}$

4. anonymous

okay so that comes out to -55/60 right but the they say -55/60 = -11/12 I am not sure how they determined that???

5. anonymous

You have to multiply $\frac{5}{5} * \frac{-11}{12}$ to get $\frac{-55}{60}$. Remember that $\frac{5}{5} = 1$ and multiplying any number by 1 will equal that number.

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