Answer
a) 0.24
b) 40,000,000
Work Step by Step
a) Simply multiply all the numbers together. Use the exponent product rule to combine the 10's. Because the exponent of 10 is negative, use the negative exponent rule to flip the negative power into a fraction. Change that to a decimal. Multiply again to get your answer.
b) First, reduce the fraction. Then, use the negative exponent rule to flip the negative power to a whole number. Use the exponent product rule to combine the 10's, and finally multiply.