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1 year ago

What would step 3 look like after you have added the two equations?

Mathematics

1 answer:

Elenna [48]1 year ago

8 0

$\begin{gathered} 8x-10y=20 \\ -8x-6y=-4 \\ -16y=16 \end{gathered}$

Adding the two equations will be adding similar terms to both equations. That is:

8x + (-8x) = 0

-10y + (-6y) = -16y

20 + (-4) = 16

Therefore, adding the two equations will look like -16y = 16. (Option 3)

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nika2105 [10]

Answer:

Surface Area = 66.4 square centimeters

Volume = 31.52 cubic centimeters

Surface Area = 113.1 square centimeters

Volume = 113.1 cubic centimeters

Step-by-step explanation:

Surface area of pyramid is area of all the surfaces. There are 4 triangles with area 1/2 * base * height

Where base is 4 and height is 6.3

Area of 4 triangles = 4 * 1/2 * 4 * 6.3 = 50.4

And area of square which is base^2 = 4 ^ 2 = 16

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Volume of Pyramid is 1/3 * area of base * height

To find height, altitude, we can drop from vertex to middle bottom. Now we can create a right triangle with hypotenuse 6.3 and base 2 (half of the side 4 cm). The altitute (height) is the other leg.

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Surface area of sphere is given by:

Surface Area of Sphere = $4\pi r^2$