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2 years ago

The answer is 2(sign)21 I need help with the work

Mathematics

1 answer:

wariber [46]2 years ago

4 0

Using Pythagoras:

$4^2+x^2=10^2\Longrightarrow x^2=10^2-4^2=100-16\text{ = }84\Longrightarrow x\text{ = }\sqrt[]{84}$ $x=\sqrt[]{84\text{ }}=\sqrt[]{2\cdot42}\text{ = }\sqrt[]{2\cdot2\cdot21}\text{ = }\sqrt[]{21\cdot2^2}\text{ =2}\cdot\sqrt[]{21}$

Answer:

$2\cdot\text{ }\sqrt[]{21}$

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zmey [24]

Answer:

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3 years ago

What is 2.34 billion in scientific notation

Gre4nikov [31]

2.34 x 10 to the 9th power i think

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3 years ago

A plane is traveling at a constant speed of K miles per hour. Which coordinate is

Anon25 [30]

Answer:

Option (A)

Step-by-step explanation:

Plane is travelling at a constant speed = K miles per hour

K = $\frac{\text{Distance}}{\text{Time}}$

Distance = k(Time)

For Time of traveling = 1 hour

Distance traveled = k × 1

= k miles

Therefore, k miles will be traveled in one 1 hour and ordered pairs of the given point on the line will be (1, k)

Option (A) will be the correct option.

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3 years ago

Help me understand this problem

Kryger [21]

It ΔABC and ΔXYZ are similar, then the sides of the triangles are in proportion.

$\dfrac{AB}{XY}=\dfrac{BC}{YZ}=\dfrac{AC}{XZ}$

We have BC = 8, AC = 7, Y = 28, XZ = 49 and YZ = 56. Substitute:

$\dfrac{AB}{XY}=\dfrac{BC}{YZ}\to\dfrac{AB}{28}=\dfrac{8}{56}\qquad\text{cross multiply}\\\\56AB=(8)(28)\qquad\text{divide both sides by 56}\\\\AB=\dfrac{224}{56}\\\\\boxed{AB=4}$

6 0

4 years ago

What is the approximate circumference of the circle shown below?<br> Plz help

USPshnik [31]

Hi. The equation for circumference is pi x diameter. I imagine this is an equation you need to know. I like to think of it as how pi is circumference/diameter, no matter what, for every circle ever, which is pretty cool. If you rearrange that you get pi x diameter.

Anyways.

Pi is approximately 3.14, which is also something I imagine you’ll need to know.

You have the radius given to you there and the diameter is double the radius, the whole width of the circle. As your radius is 10cm, your diameter will be 20cm.

20 x pi will give you roughly 62.8, so your answer is B. Hope this helps :)

3 0

3 years ago