Question

Add or Subtract. Write your answer in scientific notation.
3.3 x 10^9 + 2.6 x 10^9 + 7.7 x 10^8

Answer 1

$3.3 \times 10 {}^{9} + 2.6\times 10 {}^{9} + 7.7\times 10 {}^{8} \\ \\ 3.3 \times 10 {}^{9} + 2.6\times 10 {}^{9} +0.77 \times 10 { }^{9} \\ \\ = 10 {}^{9} (3.3 + 2.6 + 0.77) \\ \\ = 6.67 \times 10 {}^{9}$