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Yanka [14]
3 years ago
7

Which expression is equivalent to (3m^-1n^2)^4/(2m^-2n)^3? Assume M does not equal 0 and does not equal 0.

Mathematics
1 answer:
Ahat [919]3 years ago
7 0

Answer:

\frac{(3m^{-1}n^2)^4}{(2m^{-2}n)^3} =\frac{81m^{2}n^{5}}{8}

Step-by-step explanation:

\frac{(3m^{-1}n^2)^4}{(2m^{-2}n)^3}

=\frac{(3^4m^{-4}n^8)}{2^3m^{-6}n^3}

=\frac{(3^4m^{-4+6}n^{8-3})}{2^3}

=\frac{3^4m^{2}n^{5}}{2^3}

=\frac{81m^{2}n^{5}}{8}

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In the circle below, DB = 22 cm, and m<DBC = 60°. Find BC. Ignore my handwriting.​
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Answer:

BC=11\ cm

Step-by-step explanation:

step 1

Find the measure of the arc DC

we know that

The inscribed angle measures half of the arc comprising

m\angle DBC=\frac{1}{2}[arc\ DC]

substitute the values

60\°=\frac{1}{2}[arc\ DC]

120\°=arc\ DC

arc\ DC=120\°

step 2

Find the measure of arc BC

we know that

arc\ DC+arc\ BC=180\° ----> because the diameter BD divide the circle into two equal parts

120\°+arc\ BC=180\°

arc\ BC=180\°-120\°=60\°

step 3

Find the measure of angle BDC

we know that

The inscribed angle measures half of the arc comprising

m\angle BDC=\frac{1}{2}[arc\ BC]

substitute the values

m\angle BDC=\frac{1}{2}[60\°]

m\angle BDC=30\°

therefore

The triangle DBC is a right triangle ---> 60°-30°-90°

step 4

Find the measure of BC

we know that

In the right triangle DBC

sin(\angle BDC)=BC/BD

BC=(BD)sin(\angle BDC)

substitute the values

BC=(22)sin(30\°)=11\ cm

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Step-by-step explanation:

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