Answer: I'm pretty sure that it´s C but Im not sure.
Sorry if that's wrong.
5x and -8x are like terms. 6 is not a variable. 5 is the coefficient of the term 5x. X is not the constant.
If you mean 3 divided by 2 power 0 then the answer is 3
You have the comma in the wrong place.
It's 4,000,000 NOT 4000,000.
Round[4,000,000, 10]
Answer: 4 million
72×3.14=226.08 millimeters
