20. Which equation(s) are true? Select all that apply.

(4.7 x 104) + (8 x 104) = 1.27 × 105
(7.08 x 10³) + (2.21 x 103) = 9.29 X 106
(5.43 x 108) - (2.33 x 108) = 3.1 × 104
(9.35 x 106)-(6.7 x 106) = 2.65 × 106
72