1 one just divide each amount of money by 80 then subtract and boom answer!!!
The solutions to the system of equations is 
Explanation:
Given the system of equations are
and 
We need to determine the solution to the system of equations.
Let us plot the equation
in the graph.
When
, we get, 
When
, we get, 
Thus, the coordinates are (0,6) and (3,0)
Let us plot the equation
in the graph.
When
, we get, 
When
, we get, 
Thus, the coordinates are (0,-7) and (5,0)
The solution to the system of equations is the point of intersection of the two lines.
Thus, the lines intersect at the point 
The approximate values of the point is 
Thus, the solution is 
50 degrees
All triangles are 180 degrees, so you would set up an equation like this:
x+28+102=180
x+130=180
x=50
This is how you find x.