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3 years ago

Can someone tell please simplify these expressions (c)

Mathematics

1 answer:

astraxan [27]3 years ago

3 0

Answer:

12cx^2-24c

-2x^3-12x^2y

Step-by-step explanation:

They shouldn't be written like that but just distribute

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Well it matters is the 10 out of 100 if so 10 as a perecent is 10%

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Find sin 2a and cot 2a:

geniusboy [140]

Answer:

$sin(2\alpha )=2(\frac{5}{12})(\frac{12}{13})=\frac{10}{13}\\cot(2\alpha ) = \frac{16511}{18720}$

Step-by-step explanation:

$\text{if } cos(\alpha)=\frac{12}{13}\\\text{That must mean we have a triangle with base 12, and hypotenuse 13.}\\\text{Using Pythagoras, we can determine the base of the triangle must be 5.}\\a^2+b^2=c^2 \text{, where c is the hypotenuse and a, b are the two other sides.}\\c^2-b^2=a^2\\\sqrt{c^2-b^2}=a\\\sqrt{13^2-12^2}=\sqrt{169-144}=\sqrt{25}=5\\\text{Therefore, }sin(\alpha) = \frac{5}{12}\\sin(2\alpha)=2sin(\alpha )cos(\alpha)\\\text{(From double angle formulae identities)}\\$

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3 years ago

9.0 - 0.178=<br>5 points<br>Your answer

bagirrra123 [75]

Answer:

8.822. Hope this helps.

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Step-by-step explanation:

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lesya692 [45]

Ok so find 20% off and see if less tha 75
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'of' means multiply

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