A=bh/2
a=9•4.7/2=42.3/2=21.15
21.15
A number that can only be divided by 1 or 0 is prime. A composite number is a number that can be divided by 0, 1, 2, etc. I couldn't really get the question that you were trying to type, but this is what I came up with.
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Answer:
-80 is a real rational number
Step-by-step explanation:
it is real, and it is rational. It isn't irrational, and it is not a natural number either
The 2 angles in a complement would be (in degrees) 65 and 25