Guest DX's Birfday! - 7 Nov Posted December 8, 2006 Posted December 8, 2006 Ok, I'm going to take some maths problems and see if you can resolve them! First to correctly answer the problem wins a prize! This one was taken from my yesterday's Math test! Maths Test - 9th grade 7th December 2006 2) Of 24 students of the 9º2 class, 20 have a dog and twelve have a cat. Every student has at least one of these animals. Calculate the probability of, choosing a random student he having: a)the two animals b)only a cat
Matt Posted December 8, 2006 Posted December 8, 2006 You do that random tree diagram, where you do branches off with probability of something happening or not happening. For a )... For b )... I know they're not simplified down, but since it's nearing midnight and I don't have a calculator to hand... it's kind of obvious why. But is that right?
Mini-Chan Posted December 9, 2006 Posted December 9, 2006 oh my goodness... im horrible in math and wha you just did confuzzles me o_O xD
antiaircraft Posted December 9, 2006 Posted December 9, 2006 I think that's right. If it is, the simplified answers are: a) 5/12 b ) 1/12
Guest DX's Birfday! - 7 Nov Posted December 9, 2006 Posted December 9, 2006 Sorry, all are wrong! Where did you get those numbers from, Matt?!!!! I didn't know animals could be divided into fractions, poor them! Matt, I think you are confounding this with the "with reposition" and "without reposition" cases.
Matt Posted December 9, 2006 Posted December 9, 2006 Now THAT seems weird... Call me stupid (and you die. Joking... joking...), but where'd you get those numbers inside those circles from?
Superfly Posted December 9, 2006 Posted December 9, 2006 I think its a trick question, you asked for the probablity, which means it is either in fraction form or like 1:4??
Awesome_Paul Posted December 9, 2006 Posted December 9, 2006 Matt im guessing because 4 peope have cats and 12 people have dogs so teh middle circle is the half of each added together
Guest Merry HBK Xmas! Posted December 9, 2006 Posted December 9, 2006 I think its a trick question, you asked for the probablity, which means it is either in fraction form or like 1:4?? No, there's no trick in it. This question is not to answer in a form of fraction. Informally, probable is one of several words applied to uncertain events or knowledge, being closely related in meaning to likely, risky, hazardous, and doubtful. Chance, odds, and bet are other words expressing similar notions. Just as the theory of mechanics assigns precise definitions to such everyday terms as work and force, the theory of probability attempts to quantify the notion of probable. Probability always lies between 0 and 1. If probability is equal to 1 then that event is certain to happen and if the probability is 0 then that event will never occur.
Guest Merry HBK Xmas! Posted December 10, 2006 Posted December 10, 2006 Ok, resolve this 1st degree equation with two variables: x + 3 = y - 7 2y + 4x = 12 Good luck!
Guest Merry HBK Xmas! Posted December 10, 2006 Posted December 10, 2006 That's easy x=-4/3, y=26/3 By the way, are the 2 answers of your first problem 5/12 and 1/12 respectively? CORRECT! Although you didn't need a denominator for y, because both have the same common deno. which is 3. And no, the solution is above. Remember that -3 denominator is also negative on x. Your welcome! The next problem will be about Triangles!
Justin Posted December 10, 2006 Posted December 10, 2006 It's a fraction I answered!!! I mean negative 4 over 3 and 26 over 3. EDIT: Oooh! I got the prize!! It's really nice. Thx. I'd love to see more maths problems up :P It's my strength
Radiance Posted December 10, 2006 Posted December 10, 2006 Darnitt i missed it! And we were just finished doing the algebra and variables unit <_<
Superfly Posted December 10, 2006 Posted December 10, 2006 Man, I could've done that like a piece of cake :( well i'll have to see the next one about triangles!
Justin Posted December 10, 2006 Posted December 10, 2006 I was learning about triangles also~ I am looking forward to it.
Radiance Posted December 10, 2006 Posted December 10, 2006 Triangles? is he refering to geometery? With all the angles of the shapes and stuff u figure out. Zomg if it is I ACED thatt on my test :D .
Justin Posted December 10, 2006 Posted December 10, 2006 Triangle's a part of geometry I suppose. And your explanation is quite right... I got full marks in my test. DOH.
Superfly Posted December 10, 2006 Posted December 10, 2006 THen go Radiance b/c i haven't taken geometery yet, so i'll root for you during the next round.
Radiance Posted December 10, 2006 Posted December 10, 2006 Woohoo thanks hehehe. But i learned that in september hopefully i still hve my skills :evil: . Zomg have anyone learnd about parabolas?
Superfly Posted December 10, 2006 Posted December 10, 2006 I learned about them last year, they are fun once you get the hang of them ;)
Justin Posted December 10, 2006 Posted December 10, 2006 I am quite good with parabolas myself! Hehehe~ I'm good at mathematics, in general
Superfly Posted December 10, 2006 Posted December 10, 2006 SO prioryofsion128, would u like to come take my Alg 2 Test on Monday?
Radiance Posted December 10, 2006 Posted December 10, 2006 Omg i get stuck sometimes when you have to graph it grrr. like y=x2 [x squared] and then u ahve to graph y=(x-5) squared.
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