first day is 5; second day is the square of 5, so it's 25; third day is the 3 times of the second day, so it's 25x3, which is 75. Add these 3 days together to get the answer, which is 105 dollars.
K’ (-3,-3)
L’(1,-1)
M’(-1,-5)
N’(-5,-7)
D’(0,4)
E’(4,3)
F’(2,-5)
G’(-2,-4)
First, simplify the expression of the function 
highlighting the perfect square:
Then find the vertwx of parabola. When x=2, f(2)=2 and the coordinates of the vertex are (2,2). The axis of symmetry passes through the vertex and is parallel to the y-axis. Therefore, its equation is x=2 (see attached graph for details).
Answer: x=2.
Xy=k, whenever the product of two variables is a constant it is called inverse variation. This is an inverse relationship, intuitively because, as the value of one variable increases, the other decreases and vice versa.
It is easy to spot as xy=k or y=k/x.
