I need help on number 18. I know the answer, it is 12.25 but I don't know how to do the work. Can someone please help me and explain how to do the work

3.5 to the second power means 3.5 times 3.5 when you multiply. multiply as if the decimal is not there:      3.5 x    3.5      --------        175   + 1050 ____________      1225 because there is a total of two decimal places after the decimal point 3.5 (one decimal place) 3.5 (one decimal place) move the decimal point two spaces from right to left that will put the decimal in the middle and your answer would be 12.15