Wednesday

February 10, 2016
Number of results: 42,615

**chemistry**

If the rate of disappearance of dinitrogen pentoxide is 0.0300 M/s, what is the rate of appearance of nitrogen dioxide? Use your equations from part a
*April 26, 2012 by Anonymous*

**chemistry**

for each of the following unbalanced equations how many moles of thr first product are produced if 0.625mol of the second product forms.
*May 3, 2012 by nimo*

**Calculus**

1. a) Write the vector and parametric equations of the line through the points A(6, -1, 5) and B(-2, -3, 6). b) Find another point on the line in (a). ----- This is what I got for a) r = 6i-j+5k + t(-8i-2j+k) x = 6-8t y = -1-2t z = 5+t I need help with b)
*May 4, 2012 by J*

**mathURGENT!!!!!!**

the lines satisfying the equations x+2y=3 and 3y+ax=2 are perpendicular to each other. find the value of 'a'. please answer and explain how you got, please!!
*February 5, 2013 by don*

**math**

the system of linear equations below has a unique solution for all but one value of a : 5 x - 5 y = 25 48 x + a y = 240 What is this exceptional value for a ?
*October 17, 2013 by Mage*

**Math**

Can someone please explain to me exactly what type of math this is (e.g. radicals, linear equations) and how I would go about solving this?
*February 23, 2014 by Anonymous*

**Pre-Calc**

Solve the system of equations using either the substitution method or the multiplication/addition method answer: 3x+2y=14 2x-4y=4
*September 27, 2014 by Anonymous*

**maths**

The difference between 2 positive numbers, x and y where x > y, is 7 and the sum of their squares is 137. By forming 2 equations in x and y, find the product of these 2 numbers.
*March 18, 2015 by katelyn*

**Precalc**

Find a rectangular equation for the plane curve defined by the parametric equations. x = sin(theta) y = 3cos(theta)
*June 10, 2015 by Heather*

**math**

can someone help me with this math question?Solve the system of equations given below. x+3z=12 -x-2y+z=10 3x+5y+2z=-7 I am really stumped. Please help! Thanks in advance!
*July 10, 2015 by Victoria*

**algebra**

A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100 lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture? I am trying to figure the equation for...
*April 18, 2007 by sandy*

**mathematics**

from a point x a boat sails 6 km on a bearing of 038 degrees to a point y.it then sails 7 km from y on a bearing of 067 degrees to a point z.calculate the; a.distance XZ correct to two decimal places b.bearing of Z from X correct to the nearest degree
*July 17, 2015 by David simon michael*

**Calculus**

Integrate e^(-x^2/2) dx What branch of calculus is this? Is this differential equations?
*March 7, 2008 by mathstudent*

**quadratic equations**

how do you know if a quadratic equation will have 1,2 or no solutions
*January 4, 2009 by Anonymous*

**math**

how do you find the equations inverse and the domain of the inverse f(x)= 4x^2 -5
*January 13, 2009 by kayla*

**MATH**

Solve this system of equations. 3x+y+60=180 5y-5+2x=180
*January 25, 2009 by Jen*

**equations**

solve the equation 3y square-XY=0 equation(1) 2X-5Y=1 eqn (2)
*November 21, 2011 by emma*

**algebras equations**

((y+2)/(y^2-49))subtract ((y)/(y^2+6y-7)) The directions are simplify and subtract
*January 11, 2012 by Rochelle*

**math**

for the equations y=5x+50 and y=6x+25, for how many hats will the cost be the same and what is that cost?
*November 26, 2012 by Michelle*

**math**

which of the following equations has a graph that is parallel to the graph of 4x-2y=7? 1)4x+2y=2 2)-2y=4x+2 3)7-4x=2y 4)2y=4x+7 5)-4x-2y=-7
*May 21, 2013 by aman*

**Algebra**

An algebra book weighs 6oz less than twice as much as a grammar book. If 5 algebra books weigh the same as 8 grammar books, how much does an algebra book weigh.
*October 16, 2014 by Anonymous*

**mathematics **

In a collection of nickels, dimes and quarters, there are twice as many dimes as nickels, and 4 fewer quarters than dimes. The total value of the coins is $5.75. How many dimes are there in the collection ?
*May 1, 2013 by Anonymous*

**statistics**

the dean of admissions in a large university has determined that the scores of the freshman class in a mathematics test are normally distributed with a mean of 86 and a standard deviation of 11. A sample of 50 students is selected at random from the entire freshman class. ...
*March 26, 2012 by Pat*

**mathematics**

Dason favorite place is the Universal studio.He spent 3 hours in the studion and there are 5 hours left to close the Universal studio for that day. How many hours did John spent in the Universal studio.
*February 18, 2009 by john*

**Islam**

One of the important teachings of Islam is to be truthful. It is no doubt relevant when dealing with people/society. However does it apply equally in the realm of our psychology & subsconscious mind? In Psychology,it is a well known fact that one can change oneself thru ...
*May 4, 2011 by Aisyah*

**islam**

One of the important teachings of Islam is to be truthful. It is no doubt relevant when dealing with people/society. However does it apply equally in the realm of our psychology & subsconscious mind? In Psychology, it is a well known fact that one can change oneself through ...
*June 1, 2012 by shahizah*

**islamic**

One of the important teachings of Islam is to be truthful. It is no doubt relevant when dealing with people/society. However does it apply equally in the realm of our psychology & subsconscious mind? In Psychology,it is a well known fact that one can change oneself thru ...
*May 5, 2011 by hasma*

**Math- VERY IMP. PLZZZ HELP!**

Mrs Walsh is seeking legal advice. A friend of her recommended two law firms - Legal Eagles, which charges a consultation fee of $100 plus $40 per hour and A-1 Attorneys, which charges a consultation fee of $60 per hour. A) Write an equation for the cost (C) of Legal Eagles in...
*December 2, 2006 by Agnes*

**Chemistry**

what is the balanced net ionic equation for the reaction of ascorbic acid with triiodide ion C6H8O6 ==> C6H6O6+ 2H^+ + 2e 2e + I3^- ==> 3I^- ==================== These are to two half equations. Add them and cancel the electrons.
*October 8, 2006 by mary*

**Physics**

A cannon is fired from a cliff 190 m high downward at an angle of 38o with respect to the horizontal. If the muzzle velocity is 41 m/s, what is its speed (in m/s) when it hits the ground? Which equations do I need for this?
*November 8, 2007 by Lindsay*

**physics**

can someone please help me with this question quick... Which of the following equations expresses Newton's law of universal gravitation? a. Fc=MVt^2/r b. Fg=M1M2/r c. g=Gme/r^2 d. Fg=Gmme/r^2 i really need help..thanks:-)
*February 20, 2009 by Bella*

**Equations**

find the slope of the line containing the following points: (5/6 , -5) (-1/3, -1/3) can someone please help me I keep getting different answers.. I am not good at fractions especially with the negative signs... thanks
*October 8, 2009 by Kathy*

**Chemistry**

I am looking for a systematic way to balance chemical equations, instead of doing them by hand. Can someone help me understand the table in the How Does It Work? section at tinyurl dot com/28mngtt
*September 27, 2010 by Gray*

**Maths**

5. Compute the two regression equations on the basis of the following data: X Y Mean 40 45 Standard Deviation 10 9 Given that the coefficient of correlation between X & Y is 0.50. Also estimate the value of Y for X=48?
*October 9, 2010 by Neeraj Bhanot*

**Math**

Solving Equations with Grouping Symbols: 3(g-3)=6 Please explain how to do this Rules: Use Distributive Property Combine like terms Solve by using inverse operations
*January 18, 2012 by Cassie*

**CHEMISTRY**

Write equations for the solution process when ech of the following is dissolved in water. Potassium phosphate glucose Calcium chloride 1-propanol Butanone Ammonium sulfite
*February 14, 2012 by Sarah*

**mechanical science**

a c accelerates from rest in a straight line. after 12 seconds, it's velocity is measured as 42 m/s. use one of the linear equations of motion to calculate the car's acceleration
*January 8, 2013 by john*

**math **

Explain what happens when you try to solve this linear equation using an elimination strategy. What does this tell you about the graphs of these equations? -8x + 20y = -40 24x - 60y = 120
*June 11, 2013 by trixie*

**Non linear equation**

The real numbers x and y satisfy the nonlinear system of equations 2x^2−6xy+2y^2+43x+43y=174, x^2+y^2+5x+5y=30. Find the largest possible value of |xy|.
*June 19, 2013 by Mathslover*

**maths**

The real numbers x and y satisfy the nonlinear system of equations {2x2−6xy+2y2+43x+43yx2+y2+5x+5y==174,30. Find the largest possible value of |xy
*June 23, 2013 by Anonymous*

**Pre-Calculus **

Can someone please help me with this question? Show that x=a cos t+h, y=b sin t+k; 0<t<2pi (greater than and EQUAL to) are parametric equations of an ellipse with center (h,k) and axes of lengths 2a and 2b. Thank you so much!
*June 13, 2015 by Anonymous*

**Mathematics**

For example, let's say you had a beautiful clock that was always one minute late. It was too beautiful to throw away, so you decided to keep it. How slow/late would this clock be behind of all the other clocks in total for 1 year? 2 years? I got 365 minutes late for a year. ...
*September 22, 2011 by LostOne*

**Mathematics**

Kelly has twice as many CDs as Lou. Tiffany has three times as many CDs as Lou. Altogether they have 372 CDs. How many more CDs does Tiffany have than Lou?
*September 26, 2011 by Mickaela*

**math**

how do you solve this problem? 1/2x - 3 = -1 Let me make sure I understand the problem. Do you mean (1/2)x - 3 = -1, i.e. .5x-3 = -1?, or 1/(2x) - 3 = -1 I'm going to suppose you mean the first one. There is one very simple, but very important postulate of algebra you need to ...
*August 31, 2006 by vicki*

**Discrete Mathematics**

Let G be a graph with vertex set V = {v1, v2, v3, v4, v5}. A. Is it possible for the degrees of the vertices to be 3, 6, 2, 1, 5, respectively? Why or why not? B. If the degrees of the vertices are 1, 2, 3, 4, 6, respectively, how many edges are in G? C. If the degrees of the ...
*August 3, 2013 by Joy*

**math - algebra**

When solving equations by adding integers, what does it mean when one number is in parenthisis? Do you do something different when they are in parenthisis? Example below: 36 + (-28) + (-16) + 24 = y Thank you Numbers in parenthesis means the number is what it is. In the ...
*August 18, 2006 by Denise*

**College Algebra**

I'm having trouble with this word problem, I need help bad can someone please help and explain. Its kind of long. Can someone help me within the hour I'm desperate. Thanks Here's the problem: The PTO of Parksville Elementary School is having a Bazaar and all of the classes are...
*July 25, 2007 by Yvette*

**Mathematics**

Hi Just wandering When I factorise the following : 4s-16t+20r It will equal to 2 ( 2s - 8t + 10 r ) This was the answer in the book However , I managed to factorise it to become : 4 ( s-4t+5r) is this correct ? Because when you multiple it out , it gives you the same anwer ...
*August 17, 2008 by Amy*

**basic mathematics**

ii) A box contains 10 white, 7 black and 3 green balls. 2 balls are drawn at random. Find out the probability that: a) both are white b) one is white and another is green c) one is black and another is green
*December 29, 2015 by ahmed*

**mathematics**

there are 5 more girls than boys in a class. if 2 boys join the class, the ratio of girls to boys is 5:4. find the number of girls in the class.
*October 2, 2015 by bright*

**Algebra 1**

Hey :) Can anyone appoint me to a/some good link(s) for Nineth Grade Algebra? Thank you.
*January 2, 2009 by Jessie*

**algebra**

Did you hear about... (answer) Pg 211 Pizazz Algebra Rationalizing the denominator
*March 19, 2009 by HW help*

**ALGEBRA**

I have a question. I am so lost in algebra and I need to know if 3x^2=5 is quadratic? (That's 3x squared equals 5)
*September 10, 2009 by ggift*

**algebra**

8th Grade Algebra (AP) f(x)=-3x Model the rule with a table of values and a graph.
*October 5, 2009 by gabriele*

**College Algebra**

can someone tell me how to get a division symbol when posting problems in Algebra
*November 28, 2010 by Annie*

**algebra**

College Algebra Directions: Solve graphically: x^(2/3)+x^(1/3)-2=0 I just dont know how to approach this?!
*December 8, 2010 by Courtney*

**Further mathematics**

An exponential sequence (GP)of positive terms and a linear sequence (AP)have the same first term.the sum of their first terms is 3,the sum of their second terms is 3 and the sum of their third terms is 6. Find the sum of their fifth terms
*June 30, 2013 by Lizzy*

**further Mathematics**

Let A=(cosA -sinA) (sinA cosA) show that A^2=(cos2A sin2A) (sin2A cos2A)
*September 17, 2013 by James*

**algebra 2**

what does the sign that has a C and = over top of it mean in Algebra? Is it equals to or something else?
*September 3, 2007 by jen*

**9th grade- Algebra 1**

In music, What does "allegro" mean? ALGEBRA WITH PIZZAZZ!
*November 9, 2009 by Naia*

**algebra**

Enrichment Exercise Life Expectancy MAT 116 – Algebra 1A
*December 18, 2009 by C-GUTTER*

**algebra**

Solve by the elimination method: 0.3x-0.2y=4 0.4x+0.5y= -29/19 (fraction)?? Please Help I do not understand Algebra!!
*September 18, 2010 by Shannon*

**Algebra Please Help**

If x is 10, is 2/x in proportion to x/50? Why I am not understanding the question very well. Algebra is not easy for me.
*April 18, 2011 by Amy L*

**algebra**

need help with logarithmns quiz algebra 2a unit 7 connections academy
*October 7, 2012 by bee*

**algebra**

can yu help me solve my algebra problems jiskha/ I use to get help from you a year ago
*August 5, 2013 by edna *

**algebra**

can yu help me solve my algebra problems jiskha/ I use to get help from you a year ago
*August 5, 2013 by edna *

**Algebra**

Use algebra tiles to determine if 2(x +3) is equivalent to 2x +3. Explain your answer thanks
*January 21, 2015 by Will*

**Math**

In sequences and series::: I dont understand the difference between (for arthemtic series) the equations 1) sn= t/2(ti-tn) 2) (n* n-1)/2 where would you use each one and how are they different?
*December 12, 2006 by mary11*

**math**

Addition and subtraction are examples of what are best called ____ a. variables b. terms c. equations d. operations I believe the answer is is B terms
*October 7, 2008 by Jackie*

**calc**

Suppose a curve is traced by the parametric equations x=1sin(t) y=18-3cos^2(t)-4sin(t) At what point (x,y) on this curve is the tangent line horizontal?
*October 30, 2008 by alexis*

**equations**

how would i begin this problem... graph the equation and identify the y-intercept. y+x=-5 I would first rewrite that into: y=x-5 then where do I go from there, how do I know what value to put for x??
*October 8, 2009 by Kathy*

**Chemistry**

Identify the species oxidized and the species reduced in each of these redox equations A. 3Br2 + 2Ga -> 2GaBr3 B. HCL + Zn -> ZnCl2 + H2 C. Mg + N2 -> Mg3N2
*April 6, 2010 by Anonymous*

**math**

there is a circle with abcd and point at the d, there is a dice and the only side you see on the dice is two three five here is the equations P(d, 4) =
*April 25, 2010 by Angie*

**Chemistry**

I need the molecular, ionic and net ionic equations for Potassium carbonate and hydroiodic acid........i'm clueless please help as much as you can!
*October 28, 2010 by Stacy*

**8th grade**

Consider the equation 3x+5y=k, what values could k so that the x-intercept and y- intercept on teh equations graph would both be integers. explain.
*November 4, 2010 by Monkeylover:)*

**Geometry**

The measures of all angles in a regular octagon are (4x + 12)°. Find the value of x. Show equations and all work that leads to your answer.
*January 13, 2011 by Katheryn*

**MaTH**

Rearrange the terms of the equations fo form Ax + By = C I really get confused about general form, like how do I do it, I dont understand at all. x+3y = -1 2x+4y-12 = 0
*January 13, 2011 by Anna*

**MAATH**

Rearrange the terms of the equations fo form Ax + By = C I really get confused about general form, like how do I do it, I dont understand at all. x+3y = -1 2x+4y-12 = 0
*January 13, 2011 by Anna*

**new age math**

A value of the number k for which there is either no solution or an infinite number of solutions for (y,v) to the system of equations show below 7y-9v=-9 Ky+7v=7
*February 6, 2011 by Melissa*

**Gen Chem**

What are the net ionic equations for: 1. Potassium Fluoride and Ammonium Chloride and 2. Sodium Hydrogen Sulfite and Potassium Cyanide?
*March 28, 2011 by Ann*

**system of equations**

solve using any method and identify the system as consistent, inconsistent or dependent. 3x-4y=8 6x-2y=10 I want to use elimination. this is taking me forever!
*April 26, 2011 by Nancy*

**geometry**

The measures of all angles in a regular octagon are (4x + 12)°. Find the value of x. Show equations and all work that leads to your answer
*January 26, 2012 by FlowerChild*

**math:(**

how do you compare the symbolic method for solving linear equations to the method of using a table? PLEASE HELP MY BUS COMES IN 30 MINUTES!!!
*April 6, 2012 by malisa*

**Differential Equations**

Solve the differential equation below with initial conditions. Compute the first 6 coefficient. Find the general pattern. (1-x)y"-y'+xy=0 y(0)=1, y'(0)=1
*July 9, 2012 by Jason*

**Math**

Consider the following 2x2 system of linear equations, x + y = 3 x + (a^2 - 8)y = a If the system have a unique solution, then a takes any value except a=-3 and what?
*August 10, 2012 by Anonymous*

**math**

Identify the solution(s) of the system of equations, if any. x=1 y=1 I think it is C but not 100% sure.... just seems to easy a) no solutions b) (0,0) c) (1,1) d) infinitely many solutions
*January 31, 2013 by Anonymous*

**Math**

5. Find the solution to the system of equations by using either graphing or substitution. y = 6 – x and y = x – 2 (2, 4) (–4, 2) (4, 2) no solutions 6. y = 2x – 1 and y = x + 3 (1 point)(4, 7) (7, 4) (–7, –4) infinite solutions 7. y = 4x and y + x = 5 (–4, 1) (1, 4) (–3, 2) (...
*May 2, 2013 by Mr.Brain*

**math **

the length of a rectangle is equal to triple the width. which system of equations can be used to find the dimensions of the rectangle if the perimeter is 85 centimeters?
*May 30, 2013 by Anonymous*

**Math (Please help ASAP?)**

I have this weird question that has to do with linear equations (I think), and this is what it says. Let f(x) = 4x - 5 A. Find f(3) B. Find x when f(x) = -21 Can somebody help me understand this??
*May 31, 2013 by Alan*

**Math**

For how many ordered triples of positive real numbers (a,b,c), do the equations ax^2+2bx+c, bx^2+2cx+a and cx^2+2ax+b each have 2 distinct real roots?
*June 2, 2013 by Crow*

**Math**

For how many ordered triples of positive real numbers (a,b,c), do the equations ax^2+2bx+c, bx^2+2cx+a and cx^2+2ax+b each have 2 distinct real roots?
*June 10, 2013 by Crow*

**Calculus & Vectors**

Sketch the sets of complex numbers that would satisfy the following equations. a) |z| > 3 b) z = bi how would the sketches look like?
*October 3, 2013 by Rayne *

**Math**

which ordered pair is the solution of the following system of equations? y=2x-3 x+y=3 1) (1,2) 2)(2,1) 3)(3,0) 4)(3,3) MY work: y=2x-3 x+(2x-3)=3 3x-3=3 +3 +3 3x/3=6/3 x=2 x+y=3 2+y=3 -2 -2 y=1 so I got (2,1) which would be answer 2 Is this correct? Thanks for checking my work
*January 10, 2014 by B8*

**Calculus**

Find parametric equations for the line through the point (0,2,2)that is parallel to the plane x+y+z = 2 and perpendicular to the line x=1+t, y=2−t, z=2t. (Use the parameter t.) (x(t), y(t), z(t)) =
*January 31, 2014 by Jale*

**Calculus**

Find equations of both the tangent lines to the ellipse x^2 + 4y^2 = 36 that pass through the point (12, 3). smaller slope y= larger slope y=
*March 14, 2014 by Tim*

**chemistry**

which of these reactions (a) or (b) is spontaneous? Explain why. write the half cell equations for the spontaneous reaction. Identify which element is oxidized and which is reduced. (a) Fe^0+Mg^+2 --> Mg^0 + Fe^+2 (b) Fe^+2 + Mg^0 --> Fe^0 + Mg^+2
*May 19, 2014 by reneet*

**algebra2**

graph each system of equations and describe it as consistent and independent, consistent and depedneent, or inconsistent 40. x-6y=12 3x+18y=14 41. -5x-6y=13 12y+10x=-26 42. 8y-3x=15 -16y+6x=-30
*September 29, 2014 by anonymous*

**ap calc**

find the equations of ALL horizontal tangents to the curve y^2=(x^2+4)/x, if any exist This is what I have so far: xy^2= x^2+4 2xyDy/Dx =2x-y^2 dy/dx = (2x- y^2)/2xy (2x- y^2)/2xy = 0 2x-y^2 I don't know what to do next
*October 8, 2014 by Anonymous*

**Organic Chemistry**

Aqueous sodium bicarbonate was used to wash the crude t-pently chloride. What was the purpose of the wash? give equations.
*October 12, 2014 by Leslie*

**math**

triangle QRS ~ triangle EFG. Find the measures of the missing sides. QR = ? EF = 10 QS = 24 EG = 5 RS = 45 FG = ? Im having trouble setting up the equations. Please help!!
*January 21, 2015 by reece*