Math Is Fun Forum

Kenny Felder might know, he knows lots about the 83 and 84, and so might be able to help you.

Visit http://www.ncsu.edu/felder-public/kenny/papers/ti.html, and his email address is at the bottom.

Ooohh ... someone shouldn't schedule exams like that.

I hope you do well.

(If they use the same questions for other people on another day, I wonder if the results would be better?)

It seems to be a general thing - the males birds are usually the most beautiful.

I think it is something to do with impressing the females at how AMAZING they can look and still LIVE in a world of hawks and falcons.

SO, if that is true it is the species of bird that gets HUNTED where the males are gaudy and the females just fade into the woodwork.

Only the BEST for this forum!

Well impressed.

oh, this and that, and how are you ravali?

That is really impressive, stewie. Perhaps YOU should be answering the "Help Me!" forum ...

Hmmm ... if you treat (A*e^c) as a constant, call it "f" then you have:

f t^b

which is easily differentiated as

f t^b ln(b)

(derivative of a^x = a^x ln a)

There may be something special with your formula that I am not aware of, though!

Whoaa ... cool illustration!

It DRAGS space and time AROUND in a circle?

I have 3 ideas.

One is Piaget's capacity idea - you know - short fat holds the same as long thin. Use glasses of different widths/heights and coloured water.Get the kids to estimate before you pour. (Young kids often assume the tall will hold more - it is so funny when they stare in amazement as you keep pouring from tall to short and it doesn't overflow!) But older kids can do things like use measuring cups and  pens to mark things out.

Another idea is to have rocks, pebbles sand and water. Get a large glass container and fill it with rocks. Then add pebbles, and they fit (around the rocks - give it a shake)! Then add sand, and it fits! Then add water and it fits! You can show how this works by emptying then filling with water, then show the water spilling out when you add rocks, pebbles, sand.

My third idea: give them a challenge with one of these measuring puzzles

Wow, cool car!! Wouldn't want to get in its way ... could the driver see forward? What would he see? What was behind him?

Hi again, Milos. Yes, you are perfectly right! Careful of those x^2 terms!

BTW you could have a go at some of the other problems that eurasiangurl posted ...

We have a little tool that can help with that: Prime Factorization Tool, it also helps to read Prime and Composite Numbers

This tool will work out which Prime Numbers are the factors of the number you enter, but your question said "factors", and not "Prime factors", so there may be combinations that work.

Let's have a go:

7 is a Prime Number, so has no other factors (other than one or itself!) ... Answer: 2 (ie 1 and 7)
9's factors are 3 and 3 ... Answer: 3 (ie 1,3,9)
11 is Prime ... Answer: 2
25's factors are 5 and 5 ... Answer: 3
29 is Prime ... Answer: 2
47 is Prime ... Answer: 2
81 is 3x3x3x3, so it is also 3x27, 9x9 ... Answer: 5 (ie: 1,3,9,27,81)

(I notice that your question said "does the number have just one factor yes or no", so they may have taught that 1 is not a factor, in which case just subtract one from my answers!)