Thanks Hectictar,

I have been playing around with modular arithmetic lately,

It will take me a while to get my head around this.

I am not asking for more explanation, (not yet anyway) it is just a compliment.

Of course I caught your mistake. The answer was supposed to be in minutes.

It would hardly take a train 40 minutes to go through a one mile tunnel !

YOU must learn to always do sensibleness checks!

That is right but what are the units? Do you have to do a conversion?

How many minutes after the front of the train enters the tunnel does the back of the train exit the tunnel?

I am really pleased that you are interacting with me Noobguest. You will learn much better and make a better impression that way!

no

speed = distance divided by time (not multiplied by)

linear relationships graph as lines.

Non linear relationships don't.

The back of the train (and therefore the whole train) has to travel 1+1/8 miles = 1.125 miles

So

Speed = 45m/h

Distance=1.125miles

find time.

The formula is

speed = distance / time

So you should be able to work it out from there.

Ok that is a good enough reason.

I should not have mentioned it anyway. :)

Did you do the multiplication as I told you too or did not want to do any of the working or thinking for yourself?

Why did you vote my answer down Hectictar?

Do you think people should be spoon fed all their answers?

Is a good hint worse than no answer at all?

I am not cross, I am just disillusioned with the site in general.

https://web2.0calc.com/questions/help_31578#r3

Look and learn!

\(\frac{\sqrt5+\sqrt2}{\sqrt5-\sqrt2}\)

the bottom is sqrt5 - sqrt 2

You just have to multiply both the top and the bottom by sqrt5 + sqrt2

That fact that the top is the same is just a coincidence.

That is brilliant Hectictar! Thanks!

It is going int the sticky topics. Later I might combine it in one of the other threads but for now it can stand alone and people can be referred to it :)

do you mean

\(p(x)=\frac{x+9x^2+20x+100p}{x+9}\)

That really makes little sense.......

x=-9x makes no sense either.

Very nice presentation Emerald.

Yes that is right!

What happens when you try to vote Nickolas?

Oh, I see, you already gave him a point.

Two cubes have side lengths of 3 inches and 8 inches. What is the ratio of the surface area of the small cube to the surface area of the large cube? and What is the ratio of their volumes?

sides 3:8

so surface area 3^2:8^2 which is 9:64

volume is 3^3:8^3 which is 27: 512