A farmer can spend no more than $4,000 on fertilizer and seeds. The fertilizer costs $2
per pound and seeds cost $20 per pound.
To summarize the situation, the farmer writes the inequality:
2f + 209 ≤ 4,000, where f is the number of pounds of fertilizer and S is the number
of pounds of seeds.
Which graph's shaded region shows the possible combinations of fertilizer and seeds
the farmer can buy?

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.