Which of the following is/are appropriate measures of center for data set that is symmetrical?

Which of the following circles have their centers in the third quadrant?

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?