Answer:
Answer is option b) 7.2×10^7
Step-by-step explanation:
[tex]we \: know \: that \: \\ {a}^{m} \times {a}^{n} = {a}^{m + n} \\ {10}^{5} \times {10}^{2} = {10}^{5 + 2} \\ = {10}^{7} \\ 4.5 \times 1.6 = 7.20 \\ = 7.2 \\ hence \: the \: answer \: is \: 7.2 \times {10}^{7} [/tex]
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