Q 1.Matter and energy are 2.One millimeter is equal to how many meters? 3.Which of the following is true? 4.Perform the following calculation, maintaining the correct number of significant figures. Apply scientific notations if necessary: 18567 / 6.9= 5.Express the following number in scientific notation. Keep all significant digits: 278,000,000,000,000,000,000,000,000=