Simply solve for x:
-x^2 + 9 = 0 => x = 3 and x = -3;
plug x = 3 and x = -3 into the original equation you get 3 = 3 and -9 = -9, respectively;
So, the two intersecting points are (-3, -9), (3, 3).
And of course, the parabola opens down since its square term is minus.
Answer:
-49
Step-by-step explanation:
Reduce the expression, if possible, by cancelling the common factors.
Answer:
2.3
Step-by-step explanation:
n = Number of data points = 
The data set is

Mean

Absolute mean deviation

The mean absolute deviation of the data set is
.
8 4/8 - 2 2/8 = 6 2/8in or 6.25in
Answer: 
Step-by-step explanation:
Using the same-side interior angles theorem,
.
Using the alternate interior angles theorem, 