A crystal that is 0.12 millimeter long appears to be 60 millimeters long under a microscope. What is the power of the microscope? a
200:1
b
50:1
c
500:1
d
400:1

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