Math Praxis 5511 Study Guide Rated A+

Amy saves $450 every 3 months. How much does she save after 3 years? A. $4800 B.$5200 C. $5400 D. $5800 {Ans: C. $5400 450(4)=1800 (3) = 5400}Mandy can buy 4 containers of yogurt and 3 boxes of crackers for $9.55. She can buy 2 containers of yogurt and 2 boxes of crackers for $5.90. How much does one box of crackers cost? A. $1.75 B. $2.00 C. $2.25 D. $2.50 {Ans: C. $2.25 4x+3y=$9.55 2x+2y=$5.90 4x+3y=9.55/2x+2y=5.90(-2) 4x+3y=9.55 -4x-4y=-11.80 Add together -y=-2.25 or y=2.25}Which of the following problems demonstrates the associative property of multiplication? A. 2(3+4)=2(3)+2(4) B. (3x6)x2=(4x3)x3 C. (2x3)x4=2x(3x4) D. 6x4=4x6 {Ans: C. (2x3)x4=2x(3x4)}Jean participated in two stages of a bicycling race. The first stage was 400 kilometers, and his average speed was 25 kilometers per hour. The second stage was 360 kilometers, and his average speed was 24 kilometers per hour. What was Jean's total time cycling in the two stages? A. 30 hours B. 31 hours C. 32 hours D. 33 hours {Ans: B. 31 hours 400 kilometers/25 kilometers per hours = 16 hours during second stage 360 kilometers/ 24 kilometers per hours = 15 hours 15+16=31 hours}A ball has a diameter of