mr ruiz writes the expression 5×(2+1)²÷3 on the board. Chelsea says the first step is to evaluate 1².Explain Chelsea's mistake. Then, evaluate the expression ​

Standard deviation of 19,29,21,22,23

The weekly revenue for a company is r = 3p^2 + 60p + 1060, where p is the price of the company's product. what price will result in a revenue of $1200.

Amovie streaming service charges it’s customers $15 a month. martina has $98 saved up. will she have any money left over if she pays for the maximum amount of months she can afford? explain.