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vredina [299]
3 years ago
7

Can someone explain letter c?! From where did 13 come from there’s no 13 in the question..

Mathematics
2 answers:
oksian1 [2.3K]3 years ago
5 0

Answer:

Seems correct to me. I color coded the various terms.

ExtremeBDS [4]3 years ago
5 0

Step-by-step explanation:

[13x³ came by adding 9x³ and 4x³]

  • 12x²+8x-5x+9x³+2x²+4x³
  • (9x³+4x³)+(12x²+2x²)+(8x-5x)
  • 13x³+14x²+3x
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photoshop1234 [79]
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Since we know the area of a triangle is 1/2bh we know that one if the triangle in the figure is
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there are four of these so we multiply it by 4
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Add them together we get the surface area.
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4 years ago
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meriva
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5 0
4 years ago
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nataly862011 [7]

Answer:

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Step-by-step explanation:

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3 years ago
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lilavasa [31]

Answer:

Step-by-step explanation:

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