Math Is Fun Forum

No. You need to take 12% of 30 and subtract that from 30.

12% of 30 = 30 x 0.12 = 3.6

30 - 3.6 = 26.4

£26.40 is your new price.

I was able to follow you but I feel that if I try to do it for any other that I wouldnt know how to continue. Could you please explain where did you get the idea of doing all those steps? Like I said, I understand them but I wouldnt know how to develop this steps for another problem.

I just decided to use the formula to solve them but I ran into some which I couldnt find a ratio....So I guess the series is not geometric?

For example:

and also this one:

The computer played a solid game and then had a few brainfarts even allowing me to do a very simple checkmate?

Or you can just plug it in the TI-89 and be done with it.... which is what I did lol.

But yes, I'd someday like to find the time to teach myself how to factor all this kinds of equations. Im bad at factoring too.

1) If there are no restrictions then you need to choose 12 out of 20. --- 20C12

2) 6 men and 6 women. 12C6 + 12C6

and I dont know how to do to 3 and 4.

Im a Discrete math student myself and we just started to do combinatorics and permutations so maybe my 2 answers are wrong and I'd like to know the answer to the last parts.

I was able to find 2 questions logically. (#10 and #16).

However, I think this quiz is impossible because of questions like this:

19. The answer to this question is:
AA
BB
CC
DD
EE

WTF?

The function takes in the number in double and the base in integer such that when the function is called:

When we are trying to find the log of x to the base of b equals "I" then this is the same as:

and this is the same that this code is using.

First of all if the log number is negative, this code gives an error because logs are only defined for Number > 0.

If our number is nonnegative then the code proceeds and we enter a For loop from I = 0 to Number. The first check this For loop does is to see if Base ^ I = Number because if thats the case, it means that "I" is our answer to the log, therefore if thats the case then we just say that LogB=I and exit the function because we just found it.

If this is not the case then the For loop does another check and this check is to see if Base^I is less than the Number and Base^(I+1) is greater than the Number. The loop will continue looping until we find that I that makes Base^I less than Number and Base^(I+1) greater than Number. When we find this I value, this means that the answer to the log is between I and (I+1) and this is because of what we said before.

Remember that when we had a log, it was the same as this:

Base^I = Number

So in the code, if we have:

Base^I < Number
Base^(I+1) > Number

that tells us that the log is greater than I and less (I+1) so our answer is in the interval (I,I+1).

Ok, so now that we know our answer must be between I and (I+1) then the code creates another For loop which runs from 0 to 99999 and what this does is that it keeps adding 0.00001 to Lg (Lg = I) and keeps checking if Lg is our answer. We are bound to find it because we knew that our answer was between I and I+1 so if kept adding 0.00001 to I and checking, add another 0.00001 and check again, ..... , eventually we will find our answer to the log.

Thanks Daniel. I *always* have problems with this latex lol!

Hah I beat the game! I won level 14 how you said and then beat the last level!

Nice game.

By inspection I found that there are 10 routes if you can only move south and east. However, I wouldnt know how to help you with the use of Pascal's triangle.