1. 
* This is a premade sheet. Use the link at the top of the page for a printable page. 

2. 
There is a rift about 12 km west of Seaside. Scientists have been measuring the depth of the rift for over a decade now and report that it gets deeper by an average of 8.2 cm per year. If the rift was 7.8 cm deeper last year, by what percent did the depth change differ from the annual average? Round your answer to the nearest hundredth.


3. 
Rocket M accelerates at 4,977.5 m/s^{2}. Not bad. Rocket 9 accelerates at 9662 m/s^{2}. Even better. Better by how much?


4. 
You do an experiment to collect data on earthworm behavior. You test the hypothesis that "If a worm is put into a terrarium, it will begin to bury itself within 10 seconds." After analyzing the data you report that the probability that a worm will begin to bury itself within 10 seconds is 0.8. Based on this information, what is the probability that the next two worms in a row will "bury within 10 seconds?"


5. 
Aaron used Archimedes' method to calculate the density of a rock he found near Lake Laronde. The mass of the rock is 105 grams and it displaces 53 ml of water. What is its density? Round your answer to the nearest thousandth. (hint: density = mass / volume)


6. 
A class grew 30 carrots in sand and 30 in clay. After 6 weeks of growth they compared the plants to see which soil condition allowed the most root growth. The 30 from the sand had a total mass of 22.5 g and the 25 from the clay (5 died) had a mass of 15.5 g. What was the average root mass per plant from each of the experimental groups? Round your answer to the nearest thousandth of a gram.

