B 9x+10, this is because you just simply combine like terms
If n is rational, it means that

Therefore when we do n² we can write it as

Remember that the product of two integer numbers is also an integer, therefore we can guarantee that

Then we can confirm that n² is the quotient of two integers and the denominator is not zero, therefore, n² is always rational, it cannot be an irrational number
The answer is 81.1 because since the 9 place value above 5, you round the number in front of it to 1. so the answer is 81.1. I hope that helps.
Um, here is the problem. WE NEED A PICTURE TO ACTUALLY TELL YOU THE ANSWER! DO YOU WANT AN ANSWER OR NOT?????
Answer:I think that it would be either b or c
Step-by-step explanation: