This is a perfect square parabola
f(x) = (2x + 5)^2
the graph will be a parabola opening upwards and will touch the x-axis at x = -2.5
The total will be $19.72 with 20% so she will get back $30.28
The intercepts are -2 and -7 on the x-axis
Can i see a picture of the triangle/ angle ?
