a.8 x 10^15+2 x 10^15 = 10^15(8+2)=10^16=10^16 x 1
b . 8 x 10^3 x 28 x 10^-2 10 x 10^3 x 224 224 x 10 ^ 4
-------------------------------- = ---------------------------- = ------------------ =
14 x 10^-3 14 14
16 x 10^4=160000
c.
5 x 10^6 x 1.2 x 10 ^ -8 10^-2 x 6
--------------------------------- = ----------------- = 2.5 x 10^-7
2.4 x 10 ^ 5 2.4 x 10^5
