The point
is on the graph of the equation.
Explanation:
The equation is 
We need to determine the point
is on the graph.
To determine the point
is on the graph, we need to substitute the point in the equation and find whether the LHS is equal to RHS.
Thus, substituting the point
in the equation
, we get,

Multiplying the terms within the bracket, we have,

Adding the LHS, we have,

Thus, both sides of the equation are equal.
Hence, the point
is on the graph of the equation 
I think it is yz but I and not completely sure
Answer:
About 4 times per year.
Step-by-step explanation:
Research studies online.
To Visualize data changes/trends over time.
Answer:
8
Step-by-step explanation:
4.5x+10<=50
4.5x<=50-10
4.5x<=40
x<=8.9
round down because can't go beyond 50
x=8 max