21. Identify the property that justifies the statement: -9c+(4d+7)-(-9c+4d)+7 Co

Question

21. Identify the property that justifies the statement: -9c+(4d+7)-(-9c+4d)+7 Commutative Property of Addition Addition Property of Zero b. d. Associative Property of Addition Inverse Property of Addition a. c. 22. Find the perimeter of the triangle shown to the right. The dimensions given are in feet. Use the formula P=a+b+c. a. 4y +3 e. Sy+3 2y-1 b. 5y +3 d. 4y+3 2y+4 23. Translate "seven less than one third of a number" into a variable expression. b. x-7 C. x 24. Translate "the sum of four times a number and the product of the number and seven" into a variable expression and then simplify. a. 1lx b. 28x 11x2 d. 28.x 25. One cyclist rides at a speed that is 2 mph faster than a second eyclist's speed. Express the first cyclist's speed in terms of the second cyclist's speed. b. 2s a. s-2 c. 2-s d. s+2

Explanation / Answer

23) Seven less than one third of number

Answer ( c) : x/3 -7

24) The sum of four times and the product of the number and seven

Answer (a) : 11x

25) Speed in terms of second's speed

Answer (d) : s+2

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