In 1-6, for the measured quantity, state the set of numbers that most appropriately describes it. Choose from natural numbers, integers, and rational numbers. Briefly explain your answer.

1.Shoe sizes(natural numbers/ integers/ rational numbers)

2.Populations of states(natural numbers/ integers/ rational numbers)

3.Speed limits(natural numbers/ integers/ rational numbers)

4.Gallons of gasoline(natural numbers/ integers/ rational numbers)

5.Temperatures in a winter weather forecast in Montana(natural numbers/ integers/ rational numbers)

6.Numbers of DVD sale (natural numbers/ integers/ rational numbers)

2) If your salary is $50,000 per year, decreases by 50%, and then increases by 50%, what is your new salary?

3) Movement of the Pacific Plate The Pacific plate (the floor of the Pacific Ocean) near Hawaii is moving at about 0.000071 kilometer per year. This is about the speed at which a fingernail grows. Use scientific notation to determine how many kilometers the Pacific plate travels in 1 million years.