Express x in terms of a and b: b−7x=a−b

Mathematics

1 answer:

pav-90 [236]4 years ago

4 0

B - 7x = a - b
Subtract b from both sides.

-7x = a - 2b
Divide both sides by -7.

x = $\frac{-a + 2b}{7}$

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${\boxed{\mathcal{\purple{D.\:81}}}}$ ✅

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$( {3})^{ \frac{11}{5} } \div {3}^{ \frac{ - 9}{5} } \\ \\=( {3})^{ \frac{11}{5} - ( \frac{ - 9}{5} ) } \\ \\ = ( {3})^{ \frac{11}{5} + \frac{9}{5} } \\ \\ = ( {3})^{ \frac{11 + 9}{5} } \\ \\ = ( {3})^{ \frac{20}{5} } \\ \\ = ( {3})^{4} \\ \\ = ( \: 3 \times 3 \times 3 \times 3 \: ) \\ \\ = 81$