Answer:
01:55:55
Step-by-step explanation:
1 horas 55 minutos 55 segundos
the answer is 20.4 and I hope this helps!
The measure of arc EF = 146 degrees because its central angle = 146 degrees.
Negative exponents work like this:

So, in order to evaluate a negative exponent, you simply have to invert the base, and then raise to the positive equivalent of the exponent.
As an example, here are the first three exercises:



You can work out the rest applying this logic.