Answer:
its D
Step-by-step explanation:
basically all you have to do if cut off the semicircles fins their areas then find the rectangles area and add them all up
Step-by-step explanation:
Exponential function is given by general form 
Where a and b are constants.
say a=1 and b=2 then we can write function as :

or 
To graph this or any exponential function, we just need to find some points then join them by a curved line.
Like plug x=0, 1, 2,... into above function and find points:
plug x=1

Hence point is (1,2)
Find more points similarly then graph them to get the graph as shown below:
Y-intercept: 3
x-intercept: 2
put (0,3) and (2,0) as points on the graph
28 times 3 first you do 8 times 3 than 2 times 8 then add them together