Simplify each expression. Justify each step. 1. (12 + 8x) + 13

2. (7-7) + 12

3. (5 x m) x 7

Is it true that product of 3 consecutive natural numbers is always divisible by 6? justifyyour answer

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Robert plans to make a box-and-whisker plot of the following set of data. 27, 14, 46, 38, 32, 18, 21 find the lower quartile, the median, and the upper quartile of the set? lower quartile: 19.5; median: 29.5; upper quartile: 42 lower quartile: 14; median: 27; upper quartile: 46 lower quartile: 18; median: 27; upper quartile: 38 lower quartile: 16; median: 29.5; upper quartile: 42