No one can tell you the answer to this. You need to provide us with a equation which we can solve.
Solution:
Average time per line = total time / total lines
Average time per line = (3x^2 + 2)/(x + 4)
Average time per line = 3x - 12 + (3x^2 + 2)/50 milliseconds
X = 8
y = 40
the two base angles are equal to each other so you would do 5x = 40 and solve for x
a triangle has 180 total degrees. 40*2 = 80
180 - 80 = 100
2y + 20 = 100
2y = 80
y = 40
Decimal answer or rooted? If decimal, the answer's given but if rooted, the answer is 5 (with root symbol). It can't be further reduced.