Answer:
1. 
2.
and 
Step-by-step explanation:
We have the expression
to find the solutions we have to clear
. Then,
Add 64 in both sides of the equation.

Now we have to re-write the equation:
⇒
Then,

Apply square root on both members

Now substitute back 
1. 
2. 
Solving for x:
1. 
2. 
Then the solutions for
are:

To find the x intercepts of the graph
we have to replace with y=0.
This means: 
We already found the solutions for the expression, but we have to consider only the real solutions.

Because in a graph we can't have imaginary solutions.
Then the x intercepts of the graph are:
and 
The graph of the function is:
6 is the answer to the question cuz its the biggest
Answer:
(x, y) = (4, -2)
Step-by-step explanation:
The coefficient of y in the second equation is double the coefficient of y in the first. We can subtract twice the first equation from the second to eliminate y.
(3x +4) -2(x +2y) = (4) -2(0)
x = 4 . . . . . . . . . simplify
Substituting into the first equation, we have ...
4 +2y = 0
2 +y = 0 . . . . . . divide by 2
y = -2 . . . . . . . . subtract 2
The solution is (x, y) = (4, -2).
19.625cm squared because you have to divide the diameter by 2 to get the radius.
Area of circle = pi times radius times radius
= 3.14 times 2.5 times 2.5
= 19.625cm squared