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2 years ago

Which expression is equivalent to 0.2n + 2n + 4?

Mathematics

1 answer:

Bess [88]2 years ago

6 0

I think the letter B is the answer. If I'am wrong I'am so sorry but I least I was helpful.

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5cosx -2sin(x/2) +7=0 Help me to find x step by step pls

miskamm [114]

Answer:

x = 180

Step-by-step explanation:

First, you need to know

1. Double-angle formula:

cos(2x) = $cos^{2}x - sin^{2}x$

2. Pythagorean identity:

$cos^{2}x + sin^{2}x = 1$

Back to your problem, replacing the variable by the above:

$5cosx-sin\frac{x}{2}+7 = 0$

$5(cos^{2}\frac{x}{2}-sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0$ By Double-angle formula

$5(1 - 2sin^{2}\frac{x}{2}) - 2sin\frac{x}{2} + 7 = 0$ By Pythagorean identity

Given $y = \frac{x}{2}$

$5(1-2sin^{2}y) - 2siny + 7 = 0$

$10sin^{2}y+2siny-12=0$

$5sin^{2}y+siny-6=0$

$(5siny + 6)(siny - 1)=0$ , we know -1 < sinx < 1, for every x ∈ R

$siny = 1, y =90$

$y = \frac{x}{2}$

$x = 180$

8 0

2 years ago

Simplify the expression 1/(x^4)^-2

QveST [7]

Answer:

(x - 4) to the second power

Step-by-step explanation:

6 0

3 years ago

Find m < B. A)60 B)75 C)90 D)100

lozanna [386]

<B = <D = 60

answer
A. 60

7 0

3 years ago

Can anyone please help me with this?

Blizzard [7]

Answer:

Step-by-step explanation:

2/3·12=24/3=8

4 0

3 years ago

What is the vertex of f(x) = -3|x - 3| +1? A.(3,1) B.(1,3) C.(3,-1) D.(-3,1)

diamong [38]

Answer:

I think its B

Step-by-step explanation:

3 0

2 years ago