Theta is θ, which is just the symbol that takes the place of the variable so...
Theta = θ = 3/11
In short and without much fuss
let's say Anne puts "x" amount in the account at 1.2% rate annually, that means after 1 year, she will have "x" + 1.2% of "x", or 1.012x to be exact.
the 1.2% rate, kicks in as the period of a year is met.
now, what if Anne puts it in the monthly compounded type? that means, the compounding period is a month, so after 1 month, she has 1.2% extra, or 1.012x, and after 2 months, she will have 1.2% extra of 1.012x, or 1.012144x, and after 3 months, she will have 1.2% extra of 1.0121x, or 1.012145728x and so on.
anyhow, the shorter the compounding period, the more the 1.2% kicks in, the more accumulation in the account.
The angle measure of a straight line is 180°, and so if the you know that one angle off of it is (5x)°, then you know that the other section is (180 - 5x)°.
Because it's an isosceles triangle, there are two identical angles, which happen to be the angles with the measure of (5x - 30)° and (180 - 5x)°.
Since they have the same measure, 5x - 30 = 180 - 5x. Solve:

Thus,
x = 21°.
This is hard help get it from google or something
First, subtract 0.6 from both sides of the numbers and then simplify
Then multiply all terms by the same value to eliminate fraction denominators which gives us 2.8
So, n = 2.8
Hope it helps!