need help with the following, the first one is drawing a graph and the second one is plugging in the info.

X In Problems 2-5, use the description of the function to sketch a possible graph. Put a label on each axis and state whether the function is increasing or decreasing 2. The height of a sand dune is a function of time, and the wind erodes away the sand dune over time. 4. The number of air conditioning units sold is a function of temperature, and goes up as the temperature goes up. In Problems 17-20 the function S = f(t) gives the average annual sea level, S, in meters, in Aberdeen, Scotland, 7 as a function of t, the number of years before 2012. Write a mathematical expression that represents the given statement. 17. In 2000 the average annual sea level in Aberdeen was 7.049 meters. 18. The average annual sea level in Aberdeen in 2012. 19. The average annual sea level in Aberdeen was the same in 1949 and 2000. 20. The average annual sea level in Aberdeen decreased by 8 millimeters from 2011 to 2012. 30. The gas mileage of a car (in miles per gallon) is highest when the car is going about 45 miles per hour and is lower when the car is going faster or slower than 45 mph. Graph gas mileage as a function of speed of the car