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C-A 9G #1

Class Activity 9G CCSS ccsS SMP2, SMP4, 6.EE.6, 7.EE.4 Expressions for Quantities 1. There are x tons of sand in a pile initially. Then from the pile and, after that, another of a ton of sand is dumped onto the pile. Write two equivalent expressions in terms of x for the number of tons of sand that are in the pile now a. of the sand in the pile is removed b. There are x tons of sand in a pile initially. Then of a ton of sand is dumped onto the pile and, after that, of the sand in the new, larger pile is removed. Write two equivalent expressions in terms of x for the number of tons of sand that are in the pile now. Are your expressions in parts (a) and (b) equivalent or not? How can you tell? c. For each of the following expressions, describe a corresponding situation. Be sure to say what x means in each situation. 2. a. x x 30 150 4 b.+30 150 4 c. (x +30)-4+30) 150 d· (x-60) + 20-80

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