Saturday

August 2, 2014

August 2, 2014

Total # Posts: 934

**Chemistry**

Im fed up with this assignment please help The oxide formed when selenium burns in air dissolves in water to give a solution of selenious acid, H2SeO3. The solution conducts electricity, and turns blue litmus paper red. State the evidence that supports classifying H2SeO3 as an...

**math check please**

15,3,7,4,11

**Permutations**

I am having trouble with this maths problem: There are 8 people at a round table - 6 guests, 2 hosts. How many possible arrangements are there if the 2 hosts aren't allowed to sit next to each other. Thanks hint: sit the two host first, then let the guest find their seats....

**spelling**

toss is to throw

**Scl. Stds, economics**

I need help! the answers are not in our book. Who were the curbstone brokers and what type of stocks were handled on the curb? When was the wall street journal first published and what promise did it make to its readers? What is the DOW Jones Average, and how was it first calc...

**Math**

describe at least two ways of finding a missing side lenght in a pair of similar figures

**world history**

Not even a question lol.

**Maths Important**

How would you draw the graph of this x^2/16 + y^2 = 1 ( this is an ellipse if I'm not mistaken) I'm confused since y^2 has no value beneath it. so what would the coordinates be for this. the same problem with this one x^2/16 - y^2 = 1 ( a hyperbola correct) if you can ...

**Federalism**

why does slavery exist in the first place

**complex number ~**

thanks BOB =) *HUGS* 115 cis 45* 3 solutions = 120* apart Are these correct? 115 cis 45* 115 cis 45 + 120 = 165* or is it (-75*) 115 cis (45 + 120 + 120) = 285*?? or (-195*)?? It's really Matthew!I found out what it is but I will help you when you help me plz!!! Exactly ri...

**KEVIN CAN'T YOU PLEASE HELP ME!!?!?!??!?!?!?!?!**

y-2x=-5 3y-x=5 y = -5 + 2x 3y-x = 5 so 3*(-5 + 2x) - x = 5 -15 + 6x - x = 5 -15 + 5x = 5 x = 20/5 x = 4 y = -5 + 2 *4 y = 3

**complex numbers**

115 cis 45* 3 solutions = 120* apart Are these correct? 115 cis 45* 115 cis 45 + 120 = 165* 115 cis (45 + 120 + 120) = 285*?? WHat is cis? cos + isin OH LOL!!!Wish I could help!LOL!But...PLease help me!!:(

**equation complex number**

z^4 + 81 = 0 (solve) change it to polar, then take the root. z^4= 81@180 z= 3@180/4 + n90 where n=0, 1, 2, 3 check: z= 3@180/4 + 3*90=3@315 z^4=81@(4*315)=81@1260= 91@180=-81 you can check it at the other roots also. this is what i did: z^4 = - 81 z (81 cis 180)^1/4 81 ^ 1/4 ...

**complex numbers!**

-2-2i in polar form = 2.8 cis 2.35?? -3+4i polar form = 5 cis 2.2??? 1 - sqaureroot(3i) polar form = 2 cis 1.04?? What is cis? never mind I have the right answers. polar form z = r (cos O + i sin O ) is also written in an abbreviated form z = r cis O cos + sin = cis

**complex numbers**

-3 + 4i in polar form in pi the magnitude is 5 from pyth theorm. Now the angle. Using i the positive real as the reference axis, the angle from it is PI/2 + arctan4/3

**English**

please can someone help me on main ideas/central ideas I need help on this i cant figure out the central and main idea for that passage Halloween is an annual celebration, but just what is it actually a celebration of? And how did this peculiar custom originate? Is it, as some...

**Biology IMPORTANT**

LOL, y do your guys all post here about the project. I think he means Prochlorobacteria... I thought you quit biology hnrs Clair.

**English passage interpretation**

Passages 1 and 2 compose of similar knowledge to inform the reader of the Okefenokee Swamp. While the passages’ material may equally compare, the purpose and style of the pieces heavily differ. Passage 1 entails a concise expository that strictly informs the reader of var...

**physics**

The plates of a parallel plate capacitor each have an area of 0.40 m2 and are separated by a distance of 0.02 m. They are charged until the potential difference between the plates is 3000 V. The charged capacitor is then isolated. How much work is required to move a –4.0 ...

**physics**

1) A parallel plate capacitor has a potential difference between its plates of 1.2 V and a plate separation distance of 2.0 mm. What is the magnitude of the electric field if a material that has a dielectric constant of 3.3 is inserted between the plates? 2) Three point charge...

**Biology URGENT**

I'm guessing you know who I am Fubu...I'm kinda stuck on the Cyanobacteria classes.

**Biology URGENT**

Hey Fubu what is up. BTW, the scientific name is the same.

**economics - monopoly/monopsony**

just a quick qusetion....if a firm is both a monopoly and a monopsony. How would the profit maximizing wage and lvl of labour in the short run be determined for this firm Use the profit maximizing principals. Regardless of the existing market, a firm will hire until the value ...

**word unscramble**

I need to unscramble E O E R A A R V N D E I H R S E H V D L N E R L F E A G.......It has something to do with Christman

**Physics**

Four identical charges (+1.6 ìC each) are brought from infinity and fixed to a straight line. Each charge is 0.36 m from the next. Determine the electric potential energy of this group. i placed the charges as follow q1 q2 q 3 q4 and used q1 as the starting point so EPE...

**Math: Direct Variation**

y=2x+1

**Physics**

Hi, i need help on the following questions. Thank you. 1) The potential at location A is 441 V. A positively charged particle is released there from rest and arrives at location B with a speed vB. The potential at location C is 805 V, and when released from rest from this spot...

**Physics**

Hi, i need help on the following questions. Thank you. 1) The potential at location A is 441 V. A positively charged particle is released there from rest and arrives at location B with a speed vB. The potential at location C is 805 V, and when released from rest from this spot...

**physics**

2) A proton is moving parallel to a uniform electric field. The electric field accelerates the proton and increases its linear momentum to 8.6 x 10^-23 kg·m/s from 2.4 x 10^-23 kg·m/s in a time of 5.7 x 10^-6 s. What is the magnitude of the electric field? 3) A u...

**Physics**

I need help on the following questions, I am stuck and not sure on what to do, can someone work it out and or tell me steps to obtain the answer. Thank you 1) A point charge of -0.90 microC is fixed to one corner of a square. An identical charge is fixed to the diagonally oppo...

**Math (Calculus)**

Can somebody solve this logarithm problem step by step for me please: 2(lnx)² + lnx-1 = 0 First let y = ln x be a new variable, , and solve the polynomial 2 y^2 + y - 1 = 0 2(y +1)(y - 1/2) = 0 Solutions are y = -1 or +1/2 Thus x = e^y and x= 1/e = 0.3679.. OR e^0.5 = 1.6...

**Chemistry - Stoichiometry**

16.2g of magnesium reacts exactly with 25.3g of fluorine to produce magnesium fluoride, the only product. How many grams of magnesium fluoride could be produced from the reaction of 10.5g of magnesium with excess fluorine. This is simple if you use ratios... You know that 16.2...

**chemistry**

When 1.24g of an organic compound with the formula CxHyOz is burned in excess oxygen, 1.76g of carbon dioxide and 1.08g of water vapor are obtained. What is the empirical formula of the compound? Determine the moles of CO2 in 1.76grams, that will give you the moles of C in the...

**Chemistry - Stoichiometry**

Elements X and fluorine react to form two different compounds. In the first reaction 0.480g of X reacts with 1.000g of F. In the second, 0.960g of X reacts with 1.000g of F. Which are possible formulas for the two compunds First Compound Second Compound a)XF X2F2 b)XF2 XF c)XF...

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