ONLY BIG BRAIN FLOOR GANG CAN SOLVE THIS At their going-out-of-business sale, Bill's Bikes sold 39 bikes and had 55 left. Which equation could be used to find x, the number of bikes the store had originally?
A.
x - 55 = 39
B.
x + 39 = 55
C.
x - 39 = -55
D.
x + 55 = -39

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio