Well a perfect square looks like this:
6 x 6
2 x 2
So the number 72 is between the PRODUCT of two perfect squares such as those.
One product has to be above 72, and the other below it.
So lets multiply.
8 x 8 = 64
9 x 9 = 81
Oh look at that, 72 is between 64 and 81.
Answer:
(16.5 + 1.5n)° = (12 + 2n)° [given]
=> 16.5 – 12 = 2n – 1.5n
=> 4.5 = 0.5n
=> n = 4.5/0.5
=> n = 9
99.96 Or 9.960 If you prefer
I'm assuming we're solving for x.
One property of a straight line is that the angles that make a straight line have to add up to 180 degrees.
Given this information, we know that 4x + 5 + 41 = 180
4x + 46 = 180
4x = 134
x = 134/4 = 33.5
