Melody

I didn't even notice Alan. 

I was just answering the question as a separate question.

Hi mari379,

pemdas

pedmas 

they are the same because the d and the m are interchangable.

In Australia we teach BODMAS that is the same too

brackets, of (as in power of) the rest is obvious.

That is very nicely answered Rosala, thank you.

mmm 

All 5 digit numbers  5! = 120

All 4 digit numbers begining with 4,5 of 6:    3*4*3*2 = 3*4! = 72

Total = 120+72 = 192

What Stu has said is correct.

$$\begin{array}{rll}
360^0&=&2\pi\\\\
180^0&=&\pi\\\\
1^0&=&\frac{\pi}{180}\\\\
150^0&=&\frac{150\pi}{180}\\\\
150^0&=&\frac{5\pi}{6}\\\\
150^0&\approx&2.618\;\;radians\\\\

\end{array}$$

inverse tan is the same as atan.

so it is just 2nd atan

I am sorry but your question does not make sense.

Angles are directly related to time (due to the earth rotating on its axis)

they each have 

60 seconds in a minute and

then time has 60 minutes in an hour and

angles have 60 minutes in a degree.

---------------

so 60 secs in a minute 

60 minutes in a degree

60*60=3600seconds in a minute

13.6 billion light years

I don't know - Is this a trick question.

Won't it take 13.6 light years to travel 13.6 light years?