Since the 3 of them are like terms, we have to ADD all 3 of them.
4x+2x+7x= 13x
On the account with interest compounded annually, the account balance will be
P*(1 +r)^t
4500*1.06³ = 5358.57
so the interest earned will be
5358.57 -4500 = 859.57
On the account with simple interest, the interest earned will be
I = Prt
I = 4500*.06*3
I = 810.00
The total interest earned on the two accounts will be
$859.57 +810.00 = $1669.57 . . . . . . . . selection A
11:30-10:00=1 hr and 30 min
5:00-2:00=3 hrs