To multiply numbers in scientific notation, you need to multiply the coefficients and add the exponents.
In this case, we have:
(3 * 10^2) * (1.5 * 10^-5)
First, multiply the coefficients: 3 * 1.5 = 4.5
Next, add the exponents: 10^2 * 10^-5 = 10^(2 + (-5)) = 10^(-3)
So, the answer in scientific notation is 4.5 * 10^-3.
To convert this to standard form, move the decimal point three places to the left, since the exponent is negative. The result is 0.0045.
Therefore, the standard form of the expression (3 * 10^2) * (1.5 * 10^-5) is 0.0045, not 4500.