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Soloha48 [4]
3 years ago
8

There is a special offer at the book shop.

Mathematics
1 answer:
N76 [4]3 years ago
5 0

price of 3Step-by-step explanation:

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Qual é o MMC entre 6 e 9???
Inessa05 [86]

Answer:

wut

Step-by-step explanation:

wut r u sayin

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What’s the greatest common factor of 22 99
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The greatest common factor of 22 and 99 would be 11. :)

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I want to now what equals 64 please
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1 x 64=64 2 x 32=64 4 x 16 =64 8x8=64
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3 years ago
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Determine whether each expression below is always, sometimes, or never equivalent to sin x when 0° < x < 90° ? Can someone
Lubov Fominskaja [6]

Answer:

(a)\ \cos(180 - x) --- Never true

(b)\ \cos(90 -x) --- Always true

(c)\ \cos(x) ---- Sometimes true

(d)\ \cos(2x) ---- Sometimes true

Step-by-step explanation:

Given

\sin(x )

Required

Determine if the following expression is always, sometimes of never true

(a)\ \cos(180 - x)

Expand using cosine rule

\cos(180 - x) = \cos(180)\cos(x) + \sin(180)\sin(x)

\cos(180) = -1\ \ \sin(180) =0

So, we have:

\cos(180 - x) = -1*\cos(x) + 0*\sin(x)

\cos(180 - x) = -\cos(x) + 0

\cos(180 - x) = -\cos(x)

-\cos(x) \ne \sin(x)

Hence: (a) is never true

(b)\ \cos(90 -x)

Expand using cosine rule

\cos(90 -x) = \cos(90)\cos(x) + \sin(90)\sin(x)

\cos(90) = 0\ \ \sin(90) =1

So, we have:

\cos(90 -x) = 0*\cos(x) + 1*\sin(x)

\cos(90 -x) = 0+ \sin(x)

\cos(90 -x) = \sin(x)

Hence: (b) is always true

(c)\ \cos(x)

If

\sin(x) = \cos(x)

Then:

x + x = 90

2x = 90

Divide both sides by 2

x = 45

(c) is only true for x = 45

Hence: (c) is sometimes true

(d)\ \cos(2x)

If

\sin(x) = \cos(2x)

Then:

x + 2x = 90

3x = 90

Divide both sides by 2

x = 30

(d) is only true for x = 30

Hence: (d) is sometimes true

8 0
3 years ago
What is the solution to this equation?
nadya68 [22]

Answer:

A

Step-by-step explanation:

So we have the equation:

-8x+4=36

Subtract 4 from both sides:

-8x=32

Divide both sides by -8:

x=-4

And we're done!

The answer is A

3 0
4 years ago
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