tag:blogger.com,1999:blog-17802867164952138832014-10-04T18:26:49.935-07:00Science & MathematicsScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.comBlogger76125tag:blogger.com,1999:blog-1780286716495213883.post-3074827475904235702010-07-22T18:51:00.017-07:002010-07-22T18:51:29.894-07:00Very Easy maths question on exponents?625^-3/4 i know this equals 1/125<br><br /><br><br />for (-32)^3/5 this equals -8 right? I was wondering if someone could explain to me what happens to the 1 and why it is not needed in the answer, but compared to the top one it is needed.<br />first, yes (-32)^(3/5) = -8<br><br />the difference between the two is the negative sign in the exponent.<br><br />if you ignore the negative sign at first, you get 125^(-1)...<br><br />In other words 625^( 3/4) is 125.<br><br /><br><br />Any number to a -1 power will be equal to one divided by the number. Its a standard exponent property.<br />The first question, the exponent is negative, according to the exponent rule you have to put it under 1 as a fraction.<br><br /><br><br />Second question, the exponent is positive therefore no fraction is needed.<br />we know that 10^-2= 10^2 so similarly:<br><br /><br><br />625^-3/4 = 1/ (625^3/4)<br><br /><br><br />obviously 5^4=625 thus<br><br /><br><br />1/(625^3/4) = 1/(5^4^(3/4))<br><br /><br><br />we know 2^5^3= 2^(5*3) = 2^15, similarly<br><br /><br><br />1/(5^4^(3/4) = 1/5^(4*3/4) = 1/5^3<br><br /><br><br />5^3 = 125 therefore<br><br /><br><br />1/5^3 = 1/125<br><br /><br><br />proved<br><br /><br><br />cheersScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-10254364862872020742010-07-22T18:51:00.016-07:002010-07-22T18:51:28.451-07:00CALCULUS- sketch a graph of ONE function that satisfies all of the given conditions?so my teacher gave us the following problem.. and I donScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-54138476185448827152010-07-22T18:51:00.015-07:002010-07-22T18:51:26.963-07:00What is the remainder when 9^6 - 11 divided by 8?plz b fast.......i stuck up at this question....<br />9 = 1 (mod 8)<br><br /><br><br />right? Well, then:<br><br /><br><br />9^6 = 9 * 9 * 9 * 9 * 9 * 9 = 1 * 1 * 1 * 1 * 1 * 1 = 1 (mod 8)<br><br /><br><br />So:<br><br /><br><br />9^6 - 11 = 1 - 3 = 6 (mod 8)<br />(9^6-11) / 8<br><br /><br><br />=(531,441-11) / 8<br><br />=531,430 / 8<br><br />=66428.75<br />=Science & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-43374580594195796242010-07-22T18:51:00.014-07:002010-07-22T18:51:24.879-07:00I just took 250 mg of Tylonol Simply Sleep, am I okay?How much is deadly?<br />Well, lets find out shall we?<br />Given that they are the 25 mg tablets, that means you took 8 more pills than you should have. ThatScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-74965703188106374942010-07-22T18:51:00.013-07:002010-07-22T18:51:23.503-07:00Statistics help whats the difference between a t distribution and a z score?Is it true you only use a t distribution when n is less than 30<br />Yes, but under some certain circumstances. We can use a t distribution when we know the distribution of the variable is normal, so we use t distribution (this is a condition isnScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-60175847467607615092010-07-22T18:51:00.012-07:002010-07-22T18:51:21.952-07:00What is kappa alpha psi secret handshake?As you shake hands, press the BrotherScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-52617236153195300212010-07-22T18:51:00.011-07:002010-07-22T18:51:19.610-07:00Why doesnSo according to vertical motion, you add the accelaration to the initial velocity forever. Therefore, if the initial velocity is 6 and accelaration is -1, it should be:<br><br />6, 5, 4, 3, 2, 1, 0 (and that would make a total of 21) every second<br><br />but when I use the formula, d = -u^2/2a I get 18 instead? Why is this happening?<br />From 0 to 1 sec, the average velocity is (6 5)/2 = 5.5<br><br />The second second, the average is 4.5.<br><br />Then 3.5, 2.5, 1.5, .5<br><br /><br><br />Add them up and you get 18.<br />Because acceleration doesnScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-44734526564452960092010-07-22T18:51:00.010-07:002010-07-22T18:51:18.754-07:00Math 30 trig question multiple choice (best answer)?if the period of f(x)=sin(kx) where k cannot be zero, is A and the period of g(x)=absolute value(sinkx), where k cannot zero, is B then<br><br /><br><br />a) A=B b) A= 2B c) A= B d) A=1/2B<br />period of A ---Science & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-58609846746261632042010-07-22T18:51:00.009-07:002010-07-22T18:51:17.102-07:00Whats the derivative of (log(base x)e)?Hey i just need help answering the question above. thanks<br />By the Change-of-base formula:<br><br /><br><br />log_x(e) = ln(e)/ln(x) = 1/ln(x) = [ln(x)]^(-1).<br><br /><br><br />Taking derivatives with the Chain Rule yields:<br><br /><br><br />d/dx log_x(e)<br><br />=Science & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-38847158116790570532010-07-22T18:51:00.008-07:002010-07-22T18:51:14.493-07:00Which is bigger, Luxembourg or Rhode Island?i know that rhode island is the smallest state and luxembourg is like on of the worldScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-7873125965041885742010-07-22T18:51:00.007-07:002010-07-22T18:51:14.098-07:00I nEeD CHEMISTRY HELP!!!!?Double replacement reaction<br><br /><br><br /><br><br />copper(II)Chloride oxalic acid --------------Science & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-89703381949340897392010-07-22T18:51:00.006-07:002010-07-22T18:51:12.782-07:001.13e 01 mg/mL means what roughly?I need to dissolve 225mg in 1mL, The substance has a solubility of 1.13e 01 mg/mL, but Im not sure what 1.13e 01 means. IScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-5570765530090814112010-07-22T18:51:00.005-07:002010-07-22T18:51:09.699-07:00How can I prevent a rogue Sassafras tree from entering through my bedroom window at night?I swear this thing has a mind of its own. It punctures holes in my bedroom windowScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-66940136410962712462010-07-22T18:51:00.004-07:002010-07-22T18:51:08.660-07:00Should i become a doctor or a nurse?i would like to be either a pediatric oncology doctor or nurse practitioner..but i would really like to have time for a family, when i start one. which job should i choose? advice? tips? thanks!<br />I know that as a doctor, you wonScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-74872942784991375862010-07-22T18:51:00.003-07:002010-07-22T18:51:07.071-07:00Finite help..please help..this is a very difficult problem?two teams A and B are playing in a tournament where the first team to win five games wins. How many sequences are there? There are no ties.....<br><br /><br><br /><br><br />PLease Help.Please show me how to do this<br />If team A wins the tournament, then it wins the last game (because once they win the 5th game, the tournament ends). So list all sequences with 4 wins for A and either 0, 1, 2, 3 or 4 wins for B; and put a win for A at the end of all of them:<br><br /><br><br />4 wins for A and 0 wins for B obviously has only one sequence: AAAA<br><br />4 wins for A and 1 win for B has 5 sequences: BAAAA, ABAAA, AABAA, AAABA and AAAAB. This is expressed as 5C1, orScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-22842604064499733712010-07-22T18:51:00.002-07:002010-07-22T18:51:04.957-07:00Why does the single fixed plate in a parallel plate capacitor have a small but non-zero capacitance?Hi heyy, your question is self contradictory! It is not possible to have a single fixed plate in a parallel plate capacitor, sinceScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-12855828509406309112010-07-22T18:51:00.001-07:002010-07-22T18:51:03.891-07:00The atmosphereThe atmosphereScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-80411752342657123022010-07-22T18:51:00.000-07:002010-07-22T18:51:02.425-07:00If my friend shows me 3 cards, and I pick 1, what are the chances that...?my friend showed me 3 cards, face down, and 2 were jacks and 1 was an ace--i had to try and pick the 1 ace. so i picked my card, then he showed me one of the other cards (that i didnt pick) that was a jack, so now there are 2 cards face down still, one of them being my original pick. then he asked me if i wanted to switch cards, and so i did, but after i switched cards--what are the chances of me having the ace after the switch?<br />This is the famousScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-83847156701808577182010-07-22T18:50:00.021-07:002010-07-22T18:50:59.609-07:00Is this math right(for summer hw)?For a problem i have on homework, im trying to figure out how far away lighting is by the distance of the lighting and the thunder.<br><br />There is a 10 second delay between lightning and thunder. The speed of sound is 761 mph. So too figure out the distance you have too divide speed of sound with the time. so too figure out the time you next have too figure out how much of an hour is 10 seconds. so 10 / 60 = 0.166666667<br><br /><br><br />Then divide that with the speed of sound and you get 126.833334.<br><br /><br><br />So the question is....<br><br />Did I figure out the answer or did I do something wrong?<br />761 mph/60 minutes/60 seconds = .211388889 MPS = 761/3600 MPS<br><br /><br><br />We can also use scientific conversion to show this:<br><br /><br><br />761 MPH x ( [1/60 minutes]/1 hour) x ( [1/60 seconds]/1 minute) = 761 MPH x 1/60 MPM x 1/60 MPS = .211388889 MPS = 761/3600 MPS<br><br /><br><br />That is now in seconds. So multiply by 10 and move the decimal over.<br><br /><br><br />The lightning is 761/360 miles away.<br><br /><br><br />2.11388889 miles = 25.36667 blocks = 3401.981164 m = 11161.33333 ft<br />Just take 761 ft and multiply it by 10 sec. If it took ten seconds for the thunder to reach you and sound travels at 761 feet per second. 10 X 761 = Number of feet away. 7610 ft.Science & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-23267577632581303512010-07-22T18:50:00.020-07:002010-07-22T18:50:58.288-07:00ItIScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-69485768467860361842010-07-22T18:50:00.019-07:002010-07-22T18:50:57.454-07:00Can someone PLEASE simplify this expression? BEFORE TOMORROW!?-(2^3)^(-2) x 2^(-1)<br><br /><br><br />TheScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-72431511285927564632010-07-22T18:50:00.018-07:002010-07-22T18:50:54.774-07:00Force of seat upon the rider of a Ferris wheel?A 75 kg person rides a Ferris wheel which is rotating uniformly. The centripetal force acting on the person is 45 N. What force does the seat exert on the rider at the top and bottom of the ride?<br><br /><br><br />I know the answers (690 N at the top, 780 N at the bottom) but IScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-58159786479660837262010-07-22T18:50:00.017-07:002010-07-22T18:50:53.451-07:00What does this ^ symbol mean in maths?Exponentiation (Science & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-38746018249023181142010-07-22T18:50:00.016-07:002010-07-22T18:50:52.183-07:00Find the value of the limit?lim x ~Science & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0tag:blogger.com,1999:blog-1780286716495213883.post-36649204429614244052010-07-22T18:50:00.015-07:002010-07-22T18:50:50.087-07:00Bright bright moon and a shooting star ? a.s.a.p?The moon was really bright as almost as bright as the sun and a little big i think to where when i looked at it and it almost blinded me. Then when i looked down i saw a shooting star a tiny one i did make a wish not sure if it will come true or not i hope so. I am not sure if there was a star next to it or not donScience & Mathematicshttp://www.blogger.com/profile/08617622394973062112noreply@blogger.com0