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s2008m [1.1K]
3 years ago
12

If one edge of a cube is 3 inches long, what is the surface area of the cube? A. 9 square inches B. 18 square inches C. 27 squar

e inches D. 30 square inches E. 54 square inches
Mathematics
1 answer:
VLD [36.1K]3 years ago
8 0

<u>Answer:</u>

The correct answer option is E. 54 square inches.

<u>Step-by-step explanation:</u>

We are given that the length of one edge of a cube is 3 inches long and we are to find its surface area.

We know that the formula of the surface area of a cube is given by:

Surface Area of Cube = 6 a^2

Substituting the given values in the above formula to get:

Surface area of cube = 6(3)^2 = 54 square inches

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Step-by-step explanation:

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4y-x^2=-20\\x^2=4y+20\\-------\\x^2+4y^2=100\\4y+20+4y^2=100

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x^2=4y+20\\x=+-\sqrt{4y+20} \\x=+-\sqrt{4(4)+20} \\x=+-\sqrt{36} \\x=6,-6

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The pairs would be

(6,4) & (-6,4)

<u><em>we see that (-6,4) falls in the 2nd quadrant, thus this is the solution we are looking for.</em></u>

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