What are the opposites of 3, 7.5 and -2 2/3?

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).