Thursday

September 3, 2015
Number of results: 93,888

**Chem(PLEASE CAN SOMEONE EXPLAIN HOW I CAN SOLVE)**

calculate the molarities of each of the ions in a solution prepared by diluting 78mL of 4.5M Ca(ClO3)2 (aq) to 156mL with water. I dont understand how to answer this question.
*October 26, 2011 by amy*

**Algebra 2**

How do I solve these inequalities: e^3x>e^x-1 -6log (subscript of 4) x > -24 & how do I solve these: 8^x+1=3 e^x+2=50 8logx=16 I really don't understand how to solve these so can someone please explain them to me?
*April 17, 2014 by Linda*

**Chem**

How can the concept of specific heat capacity of water be used to explain the heating and cooling patterns if the oceans and the climate on the planet?? Can someone please explain this to me it would really help a lot.
*January 27, 2013 by Emily*

**Algebra, explain how to please**

Can someone explain to me how to solve -14=2/5(9-2b) It would be greatly appreciated thank you
*October 17, 2010 by June*

**Algebra, explain?**

So I have to solve this problem 9a=6(a+4) And then I wrote down: 9a=6a+24 but I don't know what to do from there, can someone explain to me please?
*October 18, 2010 by Allyson*

**chem (urgent)**

Can someone please explain to me in simple terms what the eutectic point and temperature are?
*September 16, 2011 by laura*

**Algebra II- please help!**

I just cannot seem to be able to grasp the concept of solving polynomial inequalities. Can someone please explain, step by step, how to solve them? Here's a problem I can't solve. Please use this as an example: (x-2)(x-5)<0 I cannot thank you enough for helping me with this...
*December 10, 2008 by Erin*

**8th grade math**

I need someone to explain how to solve equations with two variables and tell me what the formula or equation is? Please help and explain. Thank you!
*March 1, 2012 by saranghae12*

**math**

solve equation then check for extraneous solution please someone explain this to me. 6/6-4x/=8+4 then one that is solve the inequality s/x+3/4<2 I don't understand these problems and then it says to graph
*August 26, 2012 by kevin*

**Biology/Chem**

Can someone please explain how I would write the equation for the hydrolysis of lactose using structural formulae? Thanks.
*March 20, 2007 by Confucious*

**Maths-can someone explain something to me???**

hey, can someone explain vectors to me? im soooooo lost, I don't understand them at ALL. please please please help me. :(
*February 18, 2013 by Corie*

**grade 9 math **

Can someone please help me solve this equation. And please explain how to break this down. 4b-6+b-9= 0
*April 12, 2011 by brooke*

**AP CHEM**

A secondary alcohol results from the attachment of a hydroxy group to which carbon atom? C | <---GIVEN STRUCTURE C1-C2-C3-C4 A) C1 B) C2 C)C3 D)C4 Answer is C! I have to explain why, but the teacher never taught us anything about organic chem. So please explain!
*April 5, 2013 by Anonymous*

**Math**

Can someone please explain how to solve 3x^2+7x-15=0 by using the quadratic equation? I know that the equation is: ax^2+bx+c=0 but I get confused about how to set the problem up and solve. Thanks.
*September 26, 2009 by B.B.*

**Algebra......Help Quick!!**

12a^3bc-18a^2bc^2+6a^2c, x^2+20x+36, 12x^4-8x^3-4x^2, x^2+36x, 9x^2+6x+1, 6x^3+11x-10, x^2+3x-6..............can someone please help me solve some of these problems if not all. I have forgotten how to solve them can someone please help..Thanks
*September 2, 2008 by Carrie*

**chem**

for 2Al2O3----> 4Al(s) + 3O2 the question is what is the heat change for the formation of 1 mol of aluminum oxide from its elements? Al2O3:-1676.0 O2:0.0 Can someone please explain how to complete this problem step by step please??
*January 22, 2013 by sara*

**math**

is (-1, 5) a soultion for each system? x + y = 4 x=-1 can someone please explain how to solve this? thanks.
*September 16, 2007 by Amber*

**math**

Can someone solve this and explain it please 4^log2 (2log2 5)
*May 23, 2011 by Chuck*

**Chem**

How many sigma bonds are there in trypophan? I know the answer is 28 but I don't know how to get that answer. Can someone please explain?? Thanks!
*February 12, 2010 by Lauren*

**Algebra**

Can someone please help me with math problem and explain to me step by step how to solve it so I will know how solve other problems like this Thank you in advance Multiply and then, if possible, simplify by factoring /7x /21y
*February 28, 2012 by Anonymous*

**Math**

Can someone explain to me how to do this please!!! Solve the system of equations graphically: x+y>3 x-y<6
*May 15, 2008 by Anonymous*

**Math**

Can someone please explain to me how to solve this: Simplify 6P2. A) 30 B) 15 C) 12 D) 720
*April 23, 2015 by Carl*

**maths**

I don't understand what to do at all, I've several like this if someone could explain this one i could maybe undersatnd what to do with the rest. Thanks!! "Factorise, then solve the equation x^2=5x-36=0 then explain how you could use your answer to solve 5x^2+25x-180=0 What ...
*March 7, 2011 by Susan*

**algebra**

i do not understand how to solve for x and y can someone please explain it to me. an example of the problem i am workin on is 6x-4y=72
*April 3, 2011 by anon*

**algebra**

Use the quadratic formula to solve the equation. -4x^2-3x+2=0 Can someone please explain
*November 1, 2012 by Lee*

**Pre-Algebra**

what is the surface area of a square pyramid if the slant height is 15.2 m and the base is 15.2 m? please explain it to me. this is not homework, it is a practice question and I do not understand how to solve it. Someone PLEASE help!
*February 20, 2014 by #1Student*

**Intermediate Algebra**

solve equation (x+1)(x-2)=54 Eric stated that the solution would be (x+1)=54==> x=53 or (x-2)=54==> x=56 However at least one of these solutions fails to work when substituted back in the orginial equation. Why is that? Please help Eric to understand better, solve the ...
*June 18, 2012 by ladybug Please Help!!*

**Math (Algebra)**

Could I have someone check my work please? If I did something wrong please explain to me where I went wrong. Thank You. Example of the product rule to solve would be, (5^3)(6^3) Example of the quotient rule to solve would be, (4^2) / (8^2) Example of the power rule to solve ...
*July 18, 2010 by Lynn*

**College Algebra**

Solve 2x(squared)-3x-2=0 using the quadratic formula. Can someone explain this to me please?
*November 18, 2007 by Alicia*

**Algebra**

How would you solve this problem: Slove y=1/4-1 if the domain is(-4,-2,0,2,4) Could someone please explain to me how to do this? Thank You in advance for your help!
*January 27, 2010 by brooke*

**CHEM HELP!!!**

The solubility of AgCl(s) in water at 25 C is 1.33x10^-5 M and its deltaH of solution is 65.7 kJ/mol . What is its solubility at 60.1 C ? Please explain how to solve for this!!
*March 22, 2013 by Lena*

**math**

0.3x-0.2y=4 0.5x+0.3y=-7/17 Can anyone Please help me solve using the elimination system..... Someone tried to explain it but I still do not get it at all
*March 13, 2010 by Holly*

**Algebra2**

Can someone EXPLAIN to me how to solve for x. Please don't just give me an answer because I won't learn anything from that. sq root of (x+6) = x
*August 14, 2011 by Juan*

**Calculus**

solve (Z^2)+5=-4/Z^2 how do i solve it?? the answer is +2or-2, or, +or -i. but i really dont know how to get this answer.i tried to multiply both side by Z^2, but i think it just made it more comlicated and i didn't get the right answer at the end...can someone please explain...
*March 12, 2008 by Anne*

**geometry**

line BD bisects angle ABC. Solve for X and find the measures of angle ABC. angle ABD= 5X, angle DBC= 3X + 10 I don't really understand this question so can someone please help me solve this and explain to me how they solved it/ show the steps of how to solve this question. ...
*September 2, 2014 by Tonya*

**math**

Q: Corbin is playing a board game that requires rolling two number cubes to move a game piece. He needs to roll a sum of six on his next term and then a sum of ten to land on to the next two bonus spaces. what is the probability that Corbin will roll a sum of six and then a ...
*March 9, 2013 by dingbat*

**math 012 please help explain**

can someone please help explain how to do this problem. i have a previous posting where i tried to work the problem out, and someone tried to explain where i was confused, but im still confused. 4(2n+1)=3(6n+3)+1
*February 1, 2009 by amy*

**Chemistry**

Can someone please explain to me what was John Dalton's experiment that led to his atomic theory? I know it's the electrolysis of water, but I'd appreciate if someone could explain in detail.
*February 15, 2015 by Lucina*

**PLEASE HELP ME MATH**

someone please help i hav posted my questions like 5 times and no one is answering, can someone please solve these inequalitys 6y+1<19 2r-8>6 b-5>-2 2y+1<-5 4x-6>-10
*March 18, 2008 by Julie*

**math**

Johns football game last for 50 minutes. What reduced fraction of an hour is that? Can someone please explain to me how to solve this question?
*November 1, 2011 by Mindy*

**Calculus**

Can someone please explain how to solve this type of question? Determine the maximum and minimum value of the function f(x)=3x3^x - 1
*February 14, 2015 by Sara*

**Chem**

2H2(g)+O2(g) ---> 2H2O(l) delta H= -572kJ/mole of O2 Calculate the amount of heat evolved when 10g of hydrogen are burned in excess oxygen. Can someone please explain step by step? =D
*July 15, 2012 by Shirley*

**Math SOmeone please please help**

Find the derivative of the function. g(u) = (5+u^2)^5(3-9u^2)^8 Could someone please explain the steps that would lead me to the answer? I'm completely stuck.
*February 21, 2011 by Anonymous*

**Chem**

I dont understand how Rutherford's gold foil experiment proved that the positive charge of the atom had a very small volume in comparison to the whole atom. Could someone explain this to me please?
*July 9, 2009 by Lena*

**chem**

How many kilojoules of energy are released from the carbon carbon single bonds when glucose (C6H12O6) is burned??? i asked this before but i dont really understand it any better. can someone please explain it differently thanks
*September 6, 2009 by jake*

**Algebra**

I need help with proportions. Can someone explain to methis whole mn=pq thing or x/3=4/6 I don't understand how to di it. Please help! :) m is to n as p is to q. m/n=p/q you can solve for any of the four in terms of the others: m= np/q p=mq/n n=mq/p q=np/m
*May 27, 2007 by Avalon*

**Physics HELP!!!**

A ball is kicked at an angle of 50 with a velocity of 14m/s. a. how long is it in the air? b. how high does it rise? can someone please explain to me how to solve this???
*October 21, 2008 by Lauren*

**math calculus**

Hi could someone please explain to me how i would use the chain rule dy/dx = dy/du(du/dx) to solve for y= sin(x+y) - im looking for dy/dx i don't understand the steps thanks
*March 21, 2009 by sarah*

**geometry**

write the equations of the horizontal and vertical lines through the given points. (5,6) Can someone please show me and explain to me how to solve this? Thank you
*October 12, 2014 by Sacha*

**Math help please**

1. Solve for x. 4(x - b) = x b = 4/3x b = 3/4x x = 4/3b x = 3/4b 2. Solve for y, then find the value of y when given x = 2. 6x = 7 - 4y -12 7/4 19/4 24 I need help solving these. Can you please explain how to solve these problems?
*October 2, 2013 by Charlotte*

**math**

solve the absolute value 3/2x+4/-1=11 // stands for brackets could someone explain /2x+7/<=27 /2x+10/>26 /2x-1/=3 I do not understand if someone could help
*September 3, 2012 by brandon*

**Algebra**

I am in dire need of some help I am not understanding this at all I am to solve the systems of equations by graphing 2x-y=14 2x+3y=-10 Could someone please explain this to me in dummy terms
*June 26, 2008 by Anonymous*

**Algebra 1**

Solve this 5y+4x=4. Can someone please help me solve this step by step. I am learning,but It always helps clear things when things are explain. However, I am grateful for any help anyone can provide me. Thank you so very much. Your help is always appreciated.
*January 18, 2011 by Esther*

**chemistry**

can someone explain the leveling effect in chemistry or provide a good link please? in my chem book it says something like HNO3<H2SO4<HCl<HBr<HI<HClO4 but i dont get why they are greater/smaller
*August 5, 2011 by Henry*

**Chem Help!**

Which pair of reagents will take part in a redox reaction? A CH3CH2OH + concentrated H2SO4 B CH3CHO + Tollens’ reagent C CH3CO2C2H5 + dilute H2SO4 D CH3COCH3 + Fehling’s solution Ans: B Someone please explain! Thanks! :)
*September 30, 2014 by Ariana*

**algebra**

Solve: 0.1p + 2.1 = 4.6p - 1.9 + 0.5p I am getting all confused on how to solve this problem. can someone explain it to me?
*September 24, 2007 by Dk*

**Algebra**

I have a math CRCT test today and I needed some help on a last minute review problem. Can someone please explain how to solve this? 1. 12x-3+6x-2=31 -MC
*April 22, 2009 by mysterychicken*

**Algebra 1**

Can someone help me solve this problems please? Thank you very much 7x+9>1x+3= Can someone help me undertand the steps to solving this problem, please.
*January 3, 2011 by Erudita*

**maths logarithms**

Solve this equation: 5^2x+1 + 24(5^x) = 5 The answer has to be -1 but I can't understand how to get this answer. Can someone please explain? Thanks!
*October 17, 2007 by Claire*

**chemistry**

so we did a chem lab and one of the questions is to tabulate the amount of S2O3 consumed in moles and times (sec) for each run. I'm just not sure how to calculate the amount consumed. Can someone please explain how?
*February 1, 2014 by Anonymous*

**Biology....someone who can explain something to me**

can someone explain the Miller-Urey Experiment to me? I've read it again and again and I just don't really get it. Please help me out here.
*February 5, 2013 by Corie*

**chem equations**

could someone tell me how i could solve this chem equation CH4 + NH3 +O2...> HCN +H20 AND USE THE LOWEST WHOLE NUMBER COEFFICIENT i WOULD BE GRATEFUL FOR ANY POINTERS Try these coefficients. 2,2,3==>2,6 Hi bex heres a little more help for you. Answer is 2CH4+2NH3+3O2--&...
*May 6, 2007 by bex*

**Math- Gr.12**

Solve and use set notation. a) 6+2x > 0 > -10+2x Can someone explain how to solve this? I also had trouble doing this question: b) x+1 < 2x+7 < x+5 TIA !
*November 15, 2009 by May*

**math**

actually, in a addition to the question i posted a few minutes ago, can someone please help me with a few actual specific questions? thanks so much i'm very confused and i've been working on these all day. *Literal Equations* ~solve for x ax + bx = 8ab ~solve for y my - ny = m...
*October 26, 2007 by kim*

**Algebra check/help?**

So, for this one, it is 2x-14=3x+6 Can someone please explain to me how they would solve this problem? I think you would add 14 to the 6, but I'm not sure..
*October 19, 2010 by Allyson*

**algebra 1**

can someone please help me solve the question and explain to me and also show me specifically what to do step by step??? Q: what is the standard form of Y-8=2(x+2)?
*November 9, 2013 by Catarina*

**Math ; please please help.**

1. Explain in detail how to determine the value of the independent variable in a quadratic relation if the value of the dependent variable is known. Please check my answer - You would substitute the value for the dependent variable, then you would solve for the independent ...
*April 9, 2008 by Amanda*

**history/chem**

can someone briefly explain what did aristotle and what did plato contribute to chemistry?
*September 19, 2008 by kelli*

**math**

someone please help please help don't understand solve each literal equation for the indicated variable. (solve for s) d=c-s ______ n
*December 8, 2007 by allen*

**Chem**

Can someone explain in really simple terms the difference between Sigma and Pi bonds?
*June 18, 2008 by Alex*

**5th grade math (word problems)**

I'm not sure how to solve the following problem. I don't think i have enough information. Ali deposited $120 in her savings account. This represents 75% of the money she received for her birthday. She pent the rest of her money on a lego toy. How much did the lego cost? Can ...
*March 7, 2013 by Alex*

**Chem Help Please!**

In most cases with GLC the area under the peak as a % of the total area for all peaks is interpreted as representing the % mass of the compound measured in the mixture. Explain why this is only an approximation. I've tried to find the answer online but couldnt so can someone ...
*October 4, 2014 by Anonymous*

**jake**

The point (0,1) has the distance ____, from the line defined by y=-2x-1 How do you solve this? I tried the pythagorean theorem but I don't think I did it right as I came out with the square root of two. Can someone please explain this to me.
*October 7, 2010 by math*

**CHEMISTRY**

P + 5C2H5OH + 5/2 I2 ---> 5C2H5I + H3PO4 + H2O m(P)=4.14g m(C2H5OH)= 27.5g m(I2)=63.5g m(C2H5I)= 73g Whats the percent yield of the reaction? (Can someone more precisely explain how to solve the problem please)
*February 8, 2013 by Anonymous*

**Organic Chem Help**

Can someone explain how crystallization works to produce a product that is purer than the input material. Thank you!
*September 23, 2014 by Simon*

**Physics Someone help please!**

An example of the neutron absorption reaction is . 1 0 n+10 5 B-->7 3 Li+ 4 2 He The rest masses of each particle in atomic mass units (u) are 1 0 n= 1 u 10 5 B=10 u 7 3 Li =7 u 4 2 He= 4 u where 1u=1.66x10^-27 kg. calculate Q Q= in MeV I have the same question please ...
*May 8, 2013 by Amy*

**math/ algebra 1**

can someone please help me explain how they got this answer and can someone please show me the steps into solving this question? Q: Four more than the quotient of a number and three is at least nine.
*November 10, 2013 by ellie*

**algebra**

1. logx+log(x+48)=2 14.log50+log(x/2)=2 23.log72-log(2x/3)=0 Could someone please explain to me how to solve these?
*February 4, 2008 by chelsea*

**org. chem**

Can someone explain in simple terms the difference between hemiketal and hemiacetal? Just curious
*February 11, 2013 by meghan*

**Pre-Calculus**

Can someone please explain on how to solve this equation so I can do the others that are similar to this one? Find the solutions of the equations that are in the interval [0,2pi) cos x cot^2 x= cos x Thank you!
*May 9, 2015 by Anonymous*

**Physics help please!**

Explain why the sum of the masses of the uranium nucleus and of the neutron does not equal the total mass of the products of the reaction. I guess its a theory question. Someone please explain!
*September 12, 2014 by Ariana*

**chem**

Can someone help me I need to find out how to solve the following equation What is the PH/POH of a .0727m H3O+ Solution at 25 degrees c
*April 28, 2010 by Help*

**physics help please!!!**

The tires of a car make 63 revolutions as the car reduces its speed uniformly from 94.0 km/h to 58.0 km/h. The tires have a diameter of 0.88 m. What was the angular acceleration of each tire? And If the car continues to decelerate at this rate, how much more time is required ...
*March 26, 2010 by Anonymous*

**HELP! PHYSICS LABS!!**

CAN someone please help me...I am so confused and I have little time left to do my assingment, please! I am freaking out! Please help me!! Can someone please explain why when the centripetal force increases, so does the radius, and why when Centripetal force increases, so does...
*October 2, 2007 by Cooper-Nichol*

**Chem (Specific Heat)**

I am confused as to how to solve this problem. Can someone please tell me the steps? I know SH = heat/ mass x change in temp. What is the specific heat of a metal if 7.74 × 103 J of energy is required to warm a 75.0 g sample of the metal from 10 °C to 125 °C? THanks -MC
*February 6, 2014 by mysterychicken*

**math**

my teacher gave me exam review booklets and there is something i dont understand.. the question is : Find the slope of a line that passes through the points (-9,-3) and (-7,-1). if someone can please explain to me how to solve this it would help majorly ! :)
*January 27, 2011 by HELP exam review !*

**Algebra 2**

Can someone please explain to me how to solve logarithmic equations? Some examples are: -5=log2X 3^5x+1= 40 and log6X+(log6)7=(log6)35 I hope that makes sense because logs are hard to type.
*April 18, 2008 by JaneLee*

**pre algebra help**

9. how you would convert the repeating, non terminating decimal to a fraction? explain the process as you solve the problem. 0.1515 I dont understand this question can someone help explain this?
*September 21, 2014 by jaden*

**calculus**

I am suposed to apply L'Hospitals rule to solve. I can't seem to solve it tho. could someone explain the steps to me? Thanks! the limit as x approaches infinity of: xe^(1/x)-x This is what I got so far: xe^(1/x)-x x(e^(1/x)-1) e^(1/x)-1/(1/x) Now its in the right form to solve...
*April 14, 2009 by Riley*

**algebra 1**

a number is less than one fourth of the sum of three times the number and four. can someone please explain to me how they got this answer and can someone please show me each step.
*November 10, 2013 by morgan*

**Math **

There are 2 hats, 3 scarves, and 3 pairs of mittens How many different combinations of 1 hat, 1 scarf, and 1 pair of mittens? How would I solve this, other than writing out each combination? Could someone please explain how?
*October 11, 2010 by Amy*

**Math**

I need help on my math question. can someone please explain the process? You have $5 for lunch. You bought a turkey sandwich for $2.25. Write and solve an inequality to show how much more you can spend.
*May 20, 2014 by jelly bean*

**math(help)**

please help someone explain this please!! The length of a marathon is 138,435 ft.each stride,or step,by a particular runner is 3 ft long.does the number of strides the runner takes fit evenly into the length of the race?(EXPLAIN ANSWER PLEASE) --------------------------- IS 38...
*November 21, 2013 by matt*

**Algebra 1 (Step-by-Step)**

Will someone explain how to solve this? Write each equation in standard form. Solve by using the Quadratic Formula. 1. -7 = x^2
*May 12, 2014 by Victoria*

**Chemistry**

You have 20mL of a solution of concentration 0.015mg/mL of x in test tube #1. Prepare serial dilutions of your stock solution, and calculated the concentration of x as follows: Add 10mL of distilled water and 10mL of stock solution from test tube 1 to test tube 2. Add 10mL of ...
*November 3, 2010 by Jon*

**Pre-Calculus**

Could you please explain how to use a matrix (matrices) to solve a system of linear equations (two variables)? My book doesn't explain it in a way I can understand. Please and thank you.
*January 24, 2013 by Caroline*

**Algebra**

Simplify this expression (DO NOT solve for x) 5x+6(x+2)-8(x-3) I have no clue, can someone tell me how to solve it? Please don't tell me the answer, only how to solve it. Thanks :D
*January 15, 2015 by Me*

**Chem**

Use the following reactions to arrange the elements A, B, C, and D in order of their redox activity, from greatest to least. 2 A + B2+ --> 2 A+ + B B + D2+--> B2+ + D A+ + C -->No reaction 2 C + B2+ --> 2 C+ + B Can someone explain? thanks
*May 8, 2011 by Rebekah*

**Calculus**

I need some help understanding this limit formula, could someone please explain how to solve for f(x)=x^2+1 using this formula: (f(x+Δx)-f(x))/(Δx)
*August 30, 2009 by Christian*

**Algebra**

Please Solve: 4-x=-5 I thought the answer was -9 but that doesn't seem to be it. Can someone please help? Thanks! This is what I have: 6. 4-x=-5 The problem to solve is: 4-x=-5 Subtract 4 from both sides x = -9 Then divie by -1 Would the answer be 9? To Check: 4- - 9 = -5
*June 27, 2009 by Angie*