500
Your friend thinks that 4 x 10^3 is twice as great as 2 x 10^2. What error is your friend making? Expalin your reasoning.
What is 4 x 10^3= 4,000 and 2 x 10^2 = 200. The friend thinks that it is doubled because it is in scientific notation, but it's not in standard form because of the exponent.