this was a wrong answer.
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In base 30 its representation is 10.
Oh, dude, you're hitting me with the math questions now? Alright, so the base 10 representation of 142 base 5 is... drum roll... 47! Yeah, it's like converting currencies, but with numbers. So, in base 5, 142 is like saying 1x5^2 + 4x5^1 + 2x5^0, which equals 47 in base 10. Cool, right?
12*5=60. 60/2 is 30. The answer is 30 sq. inches.
The area is 30 units2
Triangles do not have a "length", so I am going to assume you mean the height is 5. The area would then be 30. 1/2 base x height = Area 1/2 (12) x 5 = 30