Hint: "4x 2 - 25 = 0" is nearly meaningless. You want 4x^2 - 25 = 0.
Note that both 4x^2 and 25 are perfect squares, so this is the difference of two squares, and is equal to (2x-5)(2x+5)= 0.
Use area formula (length x width)
42 x 25.5 = 1,071
Divide by total cost of wall paper
1,071/771.25 = $1.38 per square foot
You can simply count 0,1,2,3 when zero is your starting point
Y = mx + b is the equation
m = slope, or 3
b = y-intercept, or 1
y = 3x + 1
is your equation
I think it is -45
Hope this helps
