Which shows the graph of a cosine curve with amplitude 3, period pi/4 and a< 0?

Given that you don't provide a graph, I will try to solve this problem using the data written in the question. A cosine function is given by the formula:



According to the statement, the amplitude of this function is equal to . So we need to find the period that is related to like this:



 Accordingly:



So this graph is shown in the figure below. The frequency of this function is 8 times the frequency of the function and the amplitude acts as a scaling factor.

Thats where they was ported and the fields that noone really knew much about needed tended, so they put slaves out there do free work and huge profits and so on the north decided to hold its own and was more different way of survival did not have same climate conditions to afford protecting slaves from winter so expenses be diff from south