What is z over 5 - 7=2 and 1 3

Mathematics

2 answers:

dsp733 years ago

5 0

$\frac{z}{5-7}=2 \frac{1}{3} \\\\ -\frac{z}{2}=\frac{7}{3} \\\\ z=-\frac{2*7}{3} \\\\ \boxed{z=-\frac{14}{3}}$

Len [333]3 years ago

5 0

$\frac{z}{5-7}=2\frac{1}{3}\\\\\
\frac{z}{-2}=\frac{7}{3}\ \ \ |Multiply\ by\ 6\\\\
-3z=7*2\\\\
-3z=14 \ \ \ |Divide\ by\ -3\\\\
z=-\frac{14}{3}=-4\frac{2}{3}\\\\
Solution\ is\ \boxed{z=-4\frac{2}{3}}$

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A jar contains 8 4/9 pounds of jam. If Sam eats 3 2/5 pounds of the jam, how many pounds of jam remains in the jar?

zepelin [54]

$\bf 8\frac{4}{9}\implies \cfrac{8\cdot 9+4}{9}\implies \cfrac{76}{9}
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3\frac{2}{5}\implies \cfrac{3\cdot 5+2}{5}\implies \cfrac{17}{5}\\\\
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\cfrac{76}{9}-\cfrac{17}{5}\impliedby \textit{let's use an LCD of 45}\implies \cfrac{5\cdot 76-9\cdot 17}{45}
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\cfrac{380-153}{45}\implies \cfrac{227}{45}\implies \boxed{5\frac{2}{45}}
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