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Name_________________________________________________________ CCSS 6.EE.7 Date __________ Dinosaurs Read the following portion of a magazine article about studies of a Tyrannosaurus rex skeleton. Initial estimates indicated that the T. rex weighed 4.6 tons. A second estimate years later with scanning equipment indicated that the dinosaur weighed 6.5 tons. The third and most recent estimate indicated that the dinosaur weighed 140% of the previous estimate. It also estimates that in its peak growing years, a T. rex gained 4000 pounds per year. 1. Which equation can you use to find the weight increase x (in tons) from the initial estimate to the second estimate? A. 4.6 − x = 6.5 B. 4.6 + x = 6.5 C. 6.5 x = 4.6 D. 6.5 + x = 4.6 2. Which increase in estimated weight was greater, the increase from the initial estimate to the second estimate, or the increase from the second estimate to the most recent estimate? Justify your answer. 3. Suppose a T. rex weighs 3 tons when it enters its peak growing years. How long would it take the T. rex to double in weight? Explain how you found your answer. Copyright © Big Ideas Learning, LLC All rights reserved. Big Ideas Math Performance Tasks 13 CCSS 6.EE.7 Common Core State Standard 6.EE.7 Solve real-world and mathematical problems by writing and solving equations of the form x + p = q and px = q for cases in which p, q and x are all nonnegative rational numbers. CCSS 6.EE.7 Grading Rubric Answers Score 1. B 1 2. increase from second estimate to most recent; 2.6 > 1.9 2 3. 1.5 yr; Used the rate to find how long it would take the T. rex to gain 3 tons. 2 Precision 1. Student reasons that the equation is a simple addition equation. 1 2. Student calculates and compares the increases. 2 3. Student interprets the doubling in weight in terms of pounds. Student realizes that units must be converted and uses the rate to find the time. Total Points 14 Big Ideas Math Performance Tasks 2 10 Copyright © Big Ideas Learning, LLC All rights reserved.