Step-by-step explanation:
1. a + 130 =.180 ---> a = 50°
b + 130 + 120 = 360 ---> b = 110°
c + 120 = 180 ---> c = 60°
2. p + 44 = 180 ---> p = 136°
q + 44 = 180 ---> q = 136°
r = 44° (definition of vertical angles)
t = 34° (definition of vertical angles)
3. x = 50° (definition of vertical angles)
y = 50° (definition of alternate external angles)
A = 480
W = x
L = 11/5*x
therefore 480 = 11/5*x*x
480 = 11/5x^2
480*5 = 11x^2
2400/11 = x^2

However we can't have a negative width so width is

Sub this into the length equation to find length
Sure... a good example of that is when you have non-linear expressions in the system, like say for example a linear and a quadratic, like y = 4x and y = x².
recall that for a system of equations, where the graph of both equations intersect, is the solutions, check the picture below.
(1+R) to the power of n = A/P
(1+R) to the power of 4 = 3238.17/2600
(1+R) to the power of 4 = 1.245
(1+R) = 4 root 1.245
1+r = 1.05631
R = 0.05631
The interest rate percentage is 5.63% (2dp)