Give the final simplified result.
9a? - [3a - (70? + 3a)] - [2 + (15a - 2)]
= 9a² + 7a? - 150
enter the correct answer.

Can you simplify 4/7? 24 points will be awarded!

Guys i really need or i have to stay late up night

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?