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3 years ago

In one community, 78% of the over 400,000 people who speak Spanish are native speakers. Suppose a

Mathematics

1 answer:

IRINA_888 [86]3 years ago

4 0

Answer:

approximately normal

Step-by-step explanation:

khan academy

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Is it ever possible that cos (A−B)=cos ⁡A−cos ⁡B? Why or why not?

Nookie1986 [14]

Answer:

The given equation is never possible i.e cos ( A - B ) ≠ cos A - cos B

Step-by-step explanation:

Given as :

Is cos ( A - B ) = cos A - cos B

To check this possibility , Let us put the value of angle A and B on both side of equation

Now, Let A = 60° and B = 30°

From Left hand side equation

cos ( A - B ) = cos ( 60° - 30° )

Or, cos ( A - B ) = cos 30°

∴ cos ( A - B ) = $\frac{\sqrt{3} }{2}$

or, cos ( A - B ) = 0.866

From Right hand side equation

cos A - cos B = cos 60° - cos 30°

Or, cos A - cos B = $\frac{1}{2}$ - $\frac{\sqrt{3} }{2}$

∴, cos A - cos B = 0.5 - 0.866

I.e cos A - cos B = - 0.366

So, Left hand side ≠ Right hand side

Since while equating the values of angle A and b in the given equation on both sides, we get that the value of both sides are not equal , Thus we can say that the given equation is not equal to each other .

Hence given equation is never possible i.e cos ( A - B ) ≠ cos A - cos B Answer

8 0

3 years ago

The length of a picture frame is 8 inches more than the width. For what values of x is the perimeter of the picture frame greate

Travka [436]

answer

2(X+8X)=152

9X=75

X=8

5 0

3 years ago

Two boats traveling toward a lighthouse that is 20o ft above sea level at its top. When the 2 boats and the lighthouse are colli

masha68 [24]

Answer:

The measure of x= $11.35^{\circ}$

Step-by-step explanation:

We are given that

Height of tower=200ft

Distance between two boats=250 ft

From given figure

$\frac{perpendicular\;side}{base}=tan\theta$

$\frac{200}{base}=tan15^{\circ}$

$base=\frac{200}{tan15^{\circ}}=746.55 ft$

Again ,

$\frac{200}{746.55+250}=tan x$

$\frac{200}{996.55}=tan x$

$x=tan^{-1}(0.20069)=11.35^{\circ}$

Hence, the measure of x= $11.35^{\circ}$

7 0

4 years ago

Graph C (3, 2). Translate the point left 3 units and down 1 unit. Graph the image point C

Gwar [14]

I did the connexus test and the answer to your question is B the second image hope this helped a lot of people

3 0

3 years ago

A fair coin is tossed in the air 50 times. It landed on tail 24 times. What is the experiment probability that the coin will NOT

Daniel [21]

Answer:50/50

Step-by-step explanation:

It’s a 50/50 chance because there is only two sides to a coin

6 0

4 years ago