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3 years ago

What is the surface area of this square pyramid?

Mathematics

1 answer:

Viefleur [7K]3 years ago

3 0

base = 3*3 = 9 sq. in.

side = 1/2 *3*6 = 9 sq. in.

4 sides x 9 = 36 + 9 (base) = 45 in^2

Answer is A

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Change to standard form 2.57x10^-4

katrin2010 [14]

It's the mean of (2.57 x 10) minus 4
The mean is the average.

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3 years ago

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If one atom of carbon weighs 1.99 × 10^−22 g and one atom of hydrogen weighs 1.67 × 10^−27 g, which element weighs more? Explain

garik1379 [7]

Answer:

The atom of carbon weighs more

Step-by-step explanation:

we have

<em>Atom of carbon weighs</em>

$1.99*10^{-22}\ g=1.99*10^{-22}(\frac{10^{5}}{10^{5}})=199,000*10^{-22}(\frac{1}{10^{5}})=199,000*10^{-27}\ g$

<em>Atom of hydrogen weighs</em>

$1.67*10^{-27}\ g$

Compare

$199,000*10^{-27}\ g > 1.67*10^{-27}\ g$

therefore

The atom of carbon weighs more

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3 years ago

Find the circumference of this figure. Show your calculations.

solong [7]

Answer:

Circumference of circle= 37.68 units

Circumference of sector= 6.28 units

Step-by-step explanation:

The given figure is a circle with given radius OB= 6 units.

The circumference of a circle is the total length of its boundary.

For the complete circle its circumference can be calculated by;

Circumference= $2\pi r$

$=2*3.14*6\\=37.68$ units

For the circumference of the Sector with 60° in the figure, the circumference can be calculate by:

$=\frac{60}{360}* 2*\pi*6\\\\=\frac{1}{6}*12*3.14\\\\ =2*3.14\\\\=6.28$ units

So, the circumference of the full circle is 37.68 units and the circumference of the sector is 6.28 units.

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3 years ago

2 4/5 x 3 1/8 proper fraction show work

erastovalidia [21]

Answer:

answer is 8 3/4

the formula is in the picture

hope this picture helps

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My name is Ann [436]

Answer:

1/10 x 1.2 is 0.12

Step-by-step explanation:

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2 years ago