Which of the following represents the sum 4+8? Assume that red tiles represent negative numbers and blue tiles represent positive numbers.
A. four blue tiles plus eight blue tless
B. four blue files plus eight red tiles
C. four red tiles plus eight red tiles
D. four red tiles plus eight blue tiles

Traffic on saturday, it took ms. torres 24 minutes to drive 20 miles from her home to her office. during friday's rush hour, it took 75 minutes to drive the same distance. a. what was ms. torres's average speed in miles per hour on saturday? b. what was her average speed in miles per hour on friday?