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3 years ago

Someone help "explain how you would use addition to find the product of -2 and 5 "

Mathematics

2 answers:

Ksenya-84 [330]3 years ago

3 0

Use a number line, it helps a lot

Troyanec [42]3 years ago

3 0

You need to add like the normal form and then add the symbol of the bigger

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Look at the image. (calculus)

mash [69]

<h3>Answer: Choice H) 2</h3>

=============================================

Explanation:

Recall that the pythagorean trig identity is $\sin^2 x + \cos^2x = 1$

If we were to isolate sine, then,

$\sin^2 x + \cos^2x = 1\\\\\sin^2 x = 1-\cos^2x\\\\\sin x = \sqrt{1-\cos^2x}\\\\$

We don't have to worry about the plus minus because sine is positive when 0 < x < pi/2.

Through similar calculations, $\cos x = \sqrt{1-\sin^2x}\\\\$

Cosine is also positive in this quadrant.

-------------

So,

$\frac{\sqrt{1-\cos^2x}}{\sin x}+\frac{\sqrt{1-\sin^2x}}{\cos x}\\\\\frac{\sin x}{\sin x}+\frac{\cos x}{\cos x}\\\\1+1\\\\2$

Therefore,

$\frac{\sqrt{1-\cos^2x}}{\sin x}+\frac{\sqrt{1-\sin^2x}}{\cos x}=2$

is an identity as long as 0 < x < pi/2

5 0

2 years ago

Read 2 more answers

18=3(1+12 x)-5(10x+11)

madreJ [45]

18=3+36x-50x-55

18=3-14x-55

18=-14x-52

70=-14x

x=-5

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3 years ago

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Nimfa-mama [501]

A smoke and a pancake?

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Please help picture shown !!!!

never [62]

Right... soo wouldnt the a: be E??

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3 years ago

Ten students share 8 pieces of poster board equally. What fracyion pf a poece of poster board does each student get?

andrew11 [14]

When 1 is divided into 8 pieces, each piece is 1/8 of the whole.

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3 years ago