What is 99/00+44(55)99

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x