3.9 x 10^-2 in standard form July 8, 2019 16 32 64 128 3.9 x 10 2 in standard form 3.9 x 10 2 x 10 7 in standard form 3.9×10 −2 in standard form 3.9 in standard form 3.91 x 10^-2 in standard form