Mary Ellen prepares to invest $18,000, putting part of money x into the savings which pays 5% annually and rest into the account which pays 8% annually.
a. Find the possible values of x in situation?
b. If mary Ellen invests x dollars at 5%, write the equation which explains total interest I received from both accounts at the end of 1 year.
c. Graph and trace to evaluate how much Mary Ellen invested at 5% if she earned $1020 in total interst at end of first year.
d. Use the grapher to create the table of values for I to determine how much Mary Ellen must invest at 5% to earn $1185 in total interest in 1 year.