a) We know that in the northern Hemisphere we have 4 seasons: Summer where is more sun, Spring, and autumn that the sun is like 50/50 and winter that is the season with less sun. So we can made a graph with this so:
b) In this case if we have a simple interest is going to be a streight light that is going to increase. So the graph will be:
c) An item that increase it's price by 50% is going to be increasing each time more, so this case will be an exponential so the graph will be:
d) The high of a triangle and the base of the triangle are going to to have a constant rate. so the graph will be a horizontal line so: