Recent content by blue_soda025

Nobody's being cocky about anything here. But yes, you do start learning trig in gr 9. Or at least you do here.. (Canada). Obviously, it's very simple trig then, but still trig nonetheless. But yeah, you do need to know how to factor in a lot of things you do in math.

A viewer preference survey conducted by a cable-television network revealed that 46% of viewers watch sports, 31% watch comedy, and 33% watch drama. Of these viewers, 13% watch sports and comedy, 9% watch comedy and drama, and 11% watch sports and drama. Suppose 20% of viewers watch none of...

A proton moves in a circular path perpendicular to a 1.15-T magnetic field. The radius of its path is 8.40 mm. Calculate the energy of the proton in eV. So, I calculated the velocity with: qvB = \frac{mv^2}{r} (1.60 \times 10^-19)(1.15) = \frac{(6.27 \times 10^-27)v}{0.0084} v = 2.47...

Could someone help me with this problem? I don't really know how to do it.. http://www.webpost.net/bl/bluesoda025/magnetism.gif What is the magnitude and direction of force acting on wire 1 due to the magnetic field produced by wire 2?

Suppose you play a game of cards in which only four cards are dealt from a standard deck of 52 cards. How many ways are there to obtain three of a kind? (3 cards of the same rank and 1 card of a different rank, for example 3 tens and 1 queen.) Could someone help me with how to do this...

Oh, I see now.. don't know why I didn't before. Thanks!

I suppose it would be 8! = (10 - n)! then? Still don't know what to do...

I used that and multiplied both sides by (10 - n)!, then divided both sides by 90. Then I got 40320 = (10 - n)!. But that's where I got stuck.

What would be the best way to solve for n if 10Pn = 90? Also, how would you solve this problem: In a student council election, there are 3 candidates for president, 3 for secretary, and 2 for treasurer. Each student may vote for at least one position. How many ways can a ballot be marked...

Oh, I see now. Thanks a lot.

What would be the correct syntax for using the method on the array? I can't seem to get this to work.

So, I have to create a program that makes a new array with 20 slots, then it asks you to enter a value into each index, which I have here: import java.io.*; class ArrayLoop { public static void main (String[] args) throws IOException { int[] array = new int[20]; for (int i...

I'm kind of confused about whether or not an endpoint of an interval could also be a local extreme value. According to my textbook, it's true, but on the review sheets, the answers never included endpoints as local extrema. So can endpoints be local extrema?

Oh, I think I finally got the answer. I should've used \frac{y^2}{b^2}- \frac{x^2}{a^2}= 1 since the graph opens up and down. I could've sworn I did that when I attempted this the first time, but I couldn't get the answer for some reason.. Well, nevermind that. Thanks a lot for your help!

The equations are: b = \pm\sqrt{\frac{36a^2}{16 - a^2}} b = \pm\sqrt{\frac{9a^2}{1 - a^2}} Then when I try to solve for a after combining them, one side is always negative. I don't know why it is always negative, but I've tried solving for b instead of a first, and I encounter the same...