Melody

Well aren't you clever anon :))

They are receiprocals of one another  :)

$$\\$Area of sector = (angle in degrees$/360) *pi*r^2$$

9-9=0   that's the answer

I don't know what you mean either   

"h" is just the name of the function.  Often f is used but any letter can be used :)

And yes, you just replace the original t with -3t like the 2nd anon did. 

h(-3t) = -2(-3t) + 2

h(-3t) = 6t + 2

I'm guessing here but

the lioght will spread out in a sphere

the surface area of a sphere is   4*pi*r^2

r=5.2*10^18

So the surface are of THIS sphere is 

$$\\SA=4*\pi*(5.2*10^{18})^2\\
SA=4*\pi*5.2^2*10^{36}\\$$

$${\mathtt{4}}{\mathtt{\,\times\,}}{{\mathtt{5.2}}}^{{\mathtt{2}}}{\mathtt{\,\times\,}}{\mathtt{\pi}} = {\mathtt{339.794\: \!661\: \!412\: \!272\: \!036\: \!7}}$$

$$\\SA= 3.39797946614122720367 * 10^{38}\;\; M^2\\\\
Brightness \approx 8.9*10^{29}/(3.39797946614122720367 * 10^{38}) \;\;$watts per square metre$\\\\
Brightness \approx 8.9*10^{-9}/(3.39797946614122720367 ) \;\;$watts per square metre$\\\\
Brightness \approx 2.62*10^{-9} \;\;$watts per square metre$\\\\$$

I got the same as anon so maybe we are both correct    

You know TR and DL you are both right.

Maybe you should both think about what the other is trying to tell you.

You should also try being accepting of your differences    

All types of computing knowledge is invaluable in our world, including games,  but nature also has much magnificence to offer.

If you do not sometimes feel awstruck by the magnificance of a night sky or by the antics of insect as it goes about its world, then you need to spend more time with nature learning an appreciation of all it offers :)

The is no answer:    it is undefined

The value in the brackets must be between -1 and 1 inclusive.

YES absolutely

Thinks about it

$$\\\frac{6}{3}=6\div 3\\\\\\
\frac{5}{15}=5\div 15\\\\\\$$

The division sign even looks like a fraction.  

See it has the line in the middle and the two dots represent the two numbers on each side  :)