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 1 With the help of Mr. Bloop, some middle school students measured the growth rate of a fungus. An old fashioned (but still useful) apparatus called a race tube was used. A small piece of the fungus was placed at one end of a long tube that had a layer of growth medium filling it about half way. Then the distance the fungus grew down the tube was measured each day. At the end of four weeks the fungus had advanced 38 cm along the tube. What was the average speed of advance of the fungus in m/s? Express your answer using scientific notation.
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 3 Some chemical compounds are so hard to make in the lab that they can only be synthesized in tiny amounts. Professor Sneed has succeeded in making about 40 picograms of californium hexachloride, an extremely radioactive and unstable compound. After 12 hours, only 17% of the compound remains. How much is left? Express your answer in scientific notation and in grams.
 4 If there are six million yeast cells per milliliter of growth medium in an experiment, how many will there be in two days when the cell population has quadrupled and then quadrupled again? Express your answer using scientific notation.
 5 A special observatory on a mountain in Siberia monitors the number of meteoroids entering the Earth's atmosphere above the North Pole. It is an automated system that detects the flashes of light caused by their friction with the atmospheric gases. If on average the system detects 58 per day, what is the estimated annual total number of meteoroids that enter the atmosphere above the pole? Express your answer using scientific notation and assume a non-leap year.
 6 If 6.4 x 109 pieces of sand are combined with 3.8 x 109 pieces of sand, how many pieces of sand are there all together?

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