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3 years ago

When x = 5, the value of the expression 20/-25 x2(x – 10) is?

Mathematics

1 answer:

kotegsom [21]3 years ago

6 0

20/25*2(5-10)=20/25*10-20 later calculate the numbers

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I need help with this question.

scZoUnD [109]

Answer:

Step-by-step explanation:

don't ask how I got it I looked it up

4 0

3 years ago

If 2.5 mol of dust particles were laid end to end along the equator, how many times would they encircle the planet? The circumfe

Natalka [10]

Answer:

They encircle the planet $3.76\times 10^{11}$ times.

Step-by-step explanation:

Consider the provided information.

We have 2.5 mole of dust particles and the Avogadro's number is $6.022\times 10^{23}$

Thus, the number of dust particles is:

$2.5\times 6.022\times 10^{23}=15.055\times 10^{23}$

Diameter of a dust particles is 10μm and the circumference of earth is 40,076 km.

Convert the measurement in meters.

Diameter: $10\mu m\times \frac{10^{-6}m}{\mu m} =10^{-5}m$

If we line up the particles the distance they could cover is:

$15.055\times 10^{23}\times 10^{-5}=15.055\times 10^{18}=1.5055\times 10^{19}$

Circumference in meters:

$40,076km\times \frac{1000m}{1km}=40,076,000 m$

Therefore,

$\frac{1.5055\times 10^{19}}{40,076,000} = 3.76\times 10^{11}$

Hence, they encircle the planet $3.76\times 10^{11}$ times.

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3 years ago

Three randomly selected households are surveyed. The numbers of people in the households are 3, 5, and 10. Assume that samples

nalin [4]

Answer:

there is no anwser

Step-by-step explanation:

im lazy

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3 years ago

The area of a rectangle is 105 square centimeters. The width of the rectangle is 7 centimeters. What is the perimeter of the rec

Ulleksa [173]

44 because 105 ÷ 7 = 15.
So (7*2)+(15*2)=44

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3 years ago

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How do you figure up volume in cubic inches

Anna11 [10]

Measure the length, width, and depth of an object in inches. ...

Write the length of your object. ...

Multiply the length by the width of your object. ...

Multiply your answer by the depth of your object. ...

Label your answer in cubic inches.

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3 years ago