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3 years ago

20 POINTS)

Mathematics

1 answer:

olga_2 [115]3 years ago

5 0

Answer:

D) 1,2

Step-by-step explanation:

Zeroes of a function are the x-values where y= 0

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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

3 years ago

Which geometric shape could be used to model the building?

VikaD [51]

Answer:

Rectangular Prism

Step-by-step explanation:

We usually see building shaped as a 3D rectangle. If this is the type of building you are talking about, we use a rectangular prism in order to build the building with correct measurements.

8 0

2 years ago

How do you express the ratio 9 yards into 9 feet

svlad2 [7]

I have NO idea. Try searching on the enternet

4 0

3 years ago

2. Find the value of x. * 3(x + 2) RE 24

Elan Coil [88]

Answer:

x=6

Step-by-step explanation:

3(x+2) = 24

Divide each side by 3

3/3(x+2) = 24/3

x+2 = 8

Subtract 2 from each side

x+2-2 = 8-2

x=6

8 0

3 years ago

Read 2 more answers

State what additional information is required in order to know what the triangles are congruent by SSS.

soldi70 [24.7K]

Answer:

see below

Step-by-step explanation:

In order to show congruence by SSS (Side-Side-Side), you need to have 3 pairs of sides congruent. The diagram shows two pairs congruent (those of choice B), so you need information that the third pair of sides is congruent, choice D.

Any answer choices involving angles are irrelevant for SSS congruence.

4 0

3 years ago