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3 years ago

What is a stock index?

2 answers:

7 0

Is a measurement of the value of a section of the stockmarket. It is computed from the prices of selected stocks (typically a weighted average). It is a tool used by investors and financial managers to describe the market, and to compare the return on specific investments. HOPE THIS HELPS

mr_godi [17]3 years ago

3 0

The answer on Edgenuity is B

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If sinA=√3-1/2√2,then prove that cos2A=√3/2 prove that

Ivan

Answer:

$\boxed{\sf cos2A =\dfrac{\sqrt3}{2}}$

Step-by-step explanation:

Here we are given that the value of sinA is √3-1/2√2 , and we need to prove that the value of cos2A is √3/2 .

Given :-

• $\sf\implies sinA =\dfrac{\sqrt3-1}{2\sqrt2}$

To Prove :-

• $\sf\implies cos2A =\dfrac{\sqrt3}{2}$

Proof :-

We know that ,

$\sf\implies cos2A = 1 - 2sin^2A$

Therefore , here substituting the value of sinA , we have ,

$\sf\implies cos2A = 1 - 2\bigg( \dfrac{\sqrt3-1}{2\sqrt2}\bigg)^2$

Simplify the whole square ,

$\sf\implies cos2A = 1 -2\times \dfrac{ 3 +1-2\sqrt3}{8}$

Add the numbers in numerator ,

$\sf\implies cos2A = 1-2\times \dfrac{4-2\sqrt3}{8}$

Multiply it by 2 ,

$\sf\implies cos2A = 1 - \dfrac{ 4-2\sqrt3}{4}$

Take out 2 common from the numerator ,

$\sf\implies cos2A = 1-\dfrac{2(2-\sqrt3)}{4}$

Simplify ,

$\sf\implies cos2A = 1 -\dfrac{ 2-\sqrt3}{2}$

Subtract the numbers ,

$\sf\implies cos2A = \dfrac{ 2-2+\sqrt3}{2}$

Simplify,

$\sf\implies \boxed{\pink{\sf cos2A =\dfrac{\sqrt3}{2}} }$

Hence Proved !

8 0

3 years ago

Write an equation in point-slope form for the line through the given point with the given slope.

Lilit [14]

The correct answer is D) y + 1 = 4/3(x - 9)

In order to find this, simply take the point and the slope and plug into the base form of point-slope form.

y - y1 = m(x - x1)

Use the slope for m and the point for (x1, y1)

y + 1 = 4/3(x - 9)

7 0

3 years ago

An airplane on autopilot took 5 hours to travel 3 comma 510 kilometers. What is the unit rate for kilometers per hour?

loris [4]

Answer:

702 kilometers per hour.

Step-by-step explanation:

3,510 divided by 5 = 702.

Since 5 is the number of hours it took to travel 3,510 kilometers, and we need to find the kilometers per hour, simply divide 3,510 by 5.

8 0

3 years ago

Please help!!! Which equation represents the proportional relationship?

Zinaida [17]

Answer:

Step-by-step explanation:

7 0

3 years ago

_________km3 what is the volume of the pyramid

harkovskaia [24]

The volume of the pyramid is $792\ km^3$

Explanation:

It is given that the base of the pyramid is a right triangle.

The formula to determine the volume of the pyramid is given by

$V=\frac{l w h}{3}$

where l is the base length of the pyramid,

w is the base width of the pyramid and

h is the height of the pyramid.

From the figure, we can see that,

$l=9$ , $w=12$ and $h=22$

Substituting these values in the formula $V=\frac{l w h}{3}$ , we have,

$V=\frac{(9)(12)(22)}{3}$

Multiplying the numerator, we get,

$V=\frac{2376}{3}$

Dividing, we get,

$V=792$

Thus, the volume of the pyramid is $792\ km^3$

5 0

3 years ago