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Inequalities
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1.   You and your twin go to the doctor for a check up. One of you weighs 2 lb. more than the other. Last month you weighed 81 lb. and your twin weighed 2 lb. more. You both gained the same amount of weight between then and now. Which of you weighs more now, you or your twin?

2.   Mr. Brown is growing melons on his high desert farm. He knows from experience that the melons will ripen well if they get no less than fourteen inches of rain during the growing season. This year it has rained eleven times. The amount of rain (in inches) that fell each time was: 1.9, 0.4, 0.4, 2.3, 2.7, 0.7, 1.4, 0.2, 1.3, 0.9, and 1.4. Is this enough rain to allow his melon crop to be successful?

3.   Professor Sneed is slowly reviving alien skin cells from deep freeze storage. If the temperature rises too quickly, the cells will die. In fact if the temperature rise is greater than 1.8C per minute, they will die. She takes the cells out of the freezer and begins to slowly warm them. She warms them at a constant increase in temperature from -80C to 32C in 1 hour and 20 minutes. Do the cells live or die?

4.   A scientist is comparing the number of spinal column bones (vertebrae) between mackerel and groupers (mackerel and groupers are types of fish). He does a preliminary experiment. He catches five different kinds of mackerel and counts the vertebrae in each one getting the result 12, 11, 14, 13, 15. He does the same with five different kinds of grouper and gets the result 13, 15, 12, 14, 13. Do his results indicate that mackerel or grouper tend to have more vertebrae?

5.   Which expression has the largest absolute value (a) -5 + (8) ÷ -17, or (b) 5 ÷ (-17) - -8?

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Math Worksheets