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Zinaida [17]
3 years ago
15

What is the length of each edge of a cube if its surface area is 486 square units?

Mathematics
1 answer:
Luden [163]3 years ago
4 0
SA = 2LW + 2LH + 2WH

Since it is a cube, all of the dimensions, LWH, will be the same. 

SA = 2s^2 + 2s^2 + 2s^2

SA = 6s^2486 = 6s^2

Divide both sides by 681 = s^2Take the square root of both sides. 9 = s

Hope this helped☺☺
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natima [27]

Answer:

the best estimate is 25 cm

Step-by-step explanation:

the best estimate is 25 cm

because A would be too small

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D way too much

8 0
3 years ago
99 POINTS
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Answer:

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6 0
4 years ago
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Sergio039 [100]

-1/2x < -12

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Also because you are dividing by a negative number you need to reverse the inequality sign.

X > 24

4 0
3 years ago
Given m<br> ||n, find the value of x and y.<br> (3y+8) (9x+1)°<br> (x+19)°<br> m<br> n
andrezito [222]

Answer:

x = 16

y = 9

Step-by-step explanation:

Find x first. The unmarked angle underneath the x + 19 is 9x + 1 (corresponding angles so congruent so same measure as the angle below)

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combine like terms

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subtract 20

10x = 160

divide by 10

x = 16

Now you can find the measure of the angle marked 9x+1.

9(16) + 1

= 144 + 1

= 145

Now find y. The angle marked 9x+1 is now known to be a 145° angle. So that angle with the angle marked 3y+8 must make 180°

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combine like terms

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7 0
2 years ago
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Alexandra [31]
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