You see a woman standing in front of school, now and then stopping students to
ask them questions. She says she is
collecting student opinions for the
newspaper. This is an example of:
A. A convenience sample
B. A self-selected sample
C. A systematic sample
D. A random sample

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?