12. Which expression is equivalent to (8.8times 10^9)/(2.2times 10^-3) A 4times 10^12 B 4times 10^6 C 4times 10^-3 D 4times 10^-6

To solve this problem, we need to simplify the given expression $\frac {8.8\times 10^{9}}{2.2\times 10^{-3}}$.<br /><br />Step 1: Divide the coefficients.<br />$\frac {8.8}{2.2} = 4$<br /><br />Step 2: Subtract the exponents.<br />$10^{9} - (-3) = 10^{9+3} = 10^{12}$<br /><br />Step 3: Combine the results from Step 1 and Step 2.<br />$4 \times 10^{12}$<br /><br />Therefore, the expression equivalent to $\frac {8.8\times 10^{9}}{2.2\times 10^{-3}}$ is $4\times 10^{12}$.<br /><br />The correct answer is A) $4\times 10^{12}$.