If I divided 1.23x10^-10 and 1.4x10^-8, would my answer be 0.88x10^-18?

Answer 1

1.23*10^-10/1.4*10^-8 = 0.879*10^-2 =
8.79*10^-3.

When dividing, subtract the exponents:
-10 - (-8) = -10 + 8 = -2.