An international food festival charges for admission and for each sample of food. Admission and 3 samples cost $6.75. Admission and 5 samples cost $8.75. Write a linear function rule to model the cost y for any number of samples x. Please help me! I have no clue where to start! :)

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