2. Example: 5 \times 10^4 + 4 \times 10^4
= 0,5 \times 10^4 + 4 \times 10^4 (Form like terms)
= 4,5 \times 10^4 (Combine like terms)
Calculate the following. Leave the answer in scientific notation.
(a) 7,16 \times 10^5 + 2,3 \times 10^3
(b) 2,3 \times 10^{-4} + 6,5 \times 10^{-3}
(c) 4,31 \times 10^7 + 1,57 \times 10^6
(d) 6,13 \times 10^{10} + 3,89 \times 10^{-8}