Answer:
77.5
Step-by-step explanation:
in this excercise the average is 4 months (January, Febuary, March, April)
the average rate is:
![\frac{1450-1140}{4} =\frac{310}{4} = 77.5](https://tex.z-dn.net/?f=%5Cfrac%7B1450-1140%7D%7B4%7D%20%3D%5Cfrac%7B310%7D%7B4%7D%20%3D%2077.5)
82 times 18 would add up to 1,476. Hope this helped.
Vertex of a parabola exists at:
![( \frac{-b}{2a},y( \frac{-b}{2a}))](https://tex.z-dn.net/?f=%28%20%5Cfrac%7B-b%7D%7B2a%7D%2Cy%28%20%5Cfrac%7B-b%7D%7B2a%7D%29%29%20)
b = coefficient of x term = -4
a = coefficient of squared term = 1
So,
![\frac{-b}{2a}= \frac{4}{2}=2](https://tex.z-dn.net/?f=%20%5Cfrac%7B-b%7D%7B2a%7D%3D%20%5Cfrac%7B4%7D%7B2%7D%3D2%20)
and
Therefore, the vertex occurs at (2, -3)
Thus the correct answer is option D
For #1- step 1: Simplify using the inverse of addition or subtraction.
step 2: Simplify further by using the inverse of multiplication or division.