Sunday

January 22, 2017
Number of results: 46,983

**Further mathematics**

An exponential sequence of positive terms and a linear sequence have the same first terms.the sum of their second terms is 3/2 and the sum of their third terms is 6.find their fifth terms.

*November 20, 2011 by Tosin*

**to bobpursley**

I don't understand any of the information you gave me to solve the problem. Ok, write the two equations ( I did one). Now graph them. Where do they cross?

*December 10, 2006 by Joeis*

**math**

How do you write a system of linear equations in two variables? Explain this in words and by using mathematical notation in an equation.

*January 22, 2013 by ty*

**Help With Math**

Using the quadratic formula to solve equations. -12^2 + 12 x-9 = -7x^2 10x^2 + 5x + 12 = 0 6x^2 + 12x = - 1 11x^2 - 7x -1 = 0 2x^2 -18x + 16 = 0 Can u show work to help me out

*November 13, 2007 by Monte'*

**Math**

Can anyone explain Horizontal Equalities Equations? I also would appreciate examples of problems and the steps to solve the problem.

*December 7, 2007 by Jo Anne*

**Chemistry**

How can I tell if the following equations produce precipitates or not? 1. HgCl2 (aq) + K2CrO4 (aq) ==> 2. Ba(OH)2 (aq) + NaClO3 (aq) ==> 3. ZnI2 (aq) + CaSO4 (aq) ==> 4. SnCl2 (aq) + MgBr2 (aq) ==>

*January 10, 2008 by Cierra*

**Math**

Addition and subtraction are examples of what are BEST called _________? a. variables b. terms c. equations d. operations Answer would be D

*October 7, 2008 by Jen*

**chemistry**

Write balanced half-cell reactions and equations for the following: Mo24O37(s) + MnO4-(aq) makes MoO3(s) + Mn+2(aq) (BASIC)

*November 8, 2008 by kate*

**Math**

need to find the equations of the following, using Ó (and the n=1 which is at the bottom of the Ó) (and infinity is at the top of the Ó) 3) -6/3 - 4/4 - 2/5 - 0 + . . . 4) 9/1 + 36/4 +27/9 + 144/16 + . . . 5) 20/4 + 25/5 + 30/6 + 35/7 +40/8 + ... i still don't grasp how to ...

*March 29, 2009 by Janet*

**solving equations**

I need help understanding the concept of the value of an inequality DQ 2 in week 3 of math 116. any suggestions would be great!

*August 14, 2009 by cassie11*

**Math**

Arectangle has perimeter 64cm and area 23cmsquared. Solve the following system of equations to find the rectangle's dimensions.

*October 24, 2009 by Ariza*

**Organic Chem**

what is the equation including the mechanism for the reaction of 1-butanol with NaCl+ NaBr in H2S04 What are the equations for the side reactions?

*October 26, 2009 by Lori*

**math**

how can i write these equations in standard form with integer coefficients? so #1 is: y=1/2x-3/5 and also #2: y=-8/3x+4/9 I know the formula is Ax+By=C.. but I just don't get these two.. plz explain & thanks!

*October 26, 2009 by green*

**math**

Translate the problem into two linear equations by identifying keywords that represent a mathematical operation or symbol.

*May 16, 2010 by Ashly Morgan*

**math**

identify the ff properties in the given quadratic equations: a.Vertex b. axis of symmetry c. Domain d. Range e direction of graph 1.f(x)=x2-5x+14

*July 25, 2010 by kathleen*

**Math /Equations**

Hi. I need to find the distance between the two points and then round the answer to the nearest hundredth. (8,4) and (18, 28). Thank you so much.

*July 28, 2010 by Jessica*

**Chemistry**

Balance The Following Equations. _SnO2+_Ba(OH)2->_Sn(OH)4+_BaO _Al(OH)3+_(HG2)3_Po4)2->_AlPO4+_HG2(OH)

*January 4, 2011 by Sha*

**Linear Equations**

Solve using the elimination method. If the system has no solution or an infinite number of solutions, state this. 10x - y = 12.5 3x + y = 7

*May 24, 2011 by Wayne*

**chemistry**

give the full, ionic and net equations for the reaction (if any) that occurs when aqueous soulutions of Na2CO3 and MgCl2 are mixed.

*July 4, 2011 by Kayla*

**Precalc**

Write the equation of the hyperbola whose center is at the origin and has a vertical transverse axis. The equations of the asymptotes are 6x + 2y = 0 and 6x - 2y = 0. Is this correct? (y^2/9)-(x^2/4)=1

*August 21, 2011 by Sara*

**Alg 1**

I'm doing quadratic equations x^2 +bx+c =0.I'm supposed to factor each polynomial. I know how to questions like x^2 +8x +12 =0 but this one says, j^2-9jk-10k^2. I'm confused

*October 11, 2011 by Cole*

**Chemistry**

What is the threshold energy of Chromium? I know the answer but i need to show work and through all the equations to get done i get lost. So can someone help me.

*October 12, 2011 by Casey*

**calculus**

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the line x = 6. y = 6 − x y = 0 y = 5 x = 0

*January 23, 2012 by ME*

**Geometry**

two perpendicular lines with the equations y=1/3x+9 and y=mx-3 contain the consecutive sides of a rectangle. What is the value of mx in the 2nd linear question.

*March 25, 2012 by monique*

**calculus**

sketch the region R bounded by the graphs of the equations, and find the volume of the solid generated if R is revolved about the x axis when y=x^2 y=4-x^2

*May 1, 2012 by dario*

**calculus**

Sketch the region R bounded by the graphs of the equations and find the volume of the solid generated if R is revolved around the x axis. x= y^2 x-y =2

*May 1, 2012 by casquibaldo*

**calculus**

find the volume of the solid generated by revolving the region bounded by the graphs of the equations y=2sqrtx, y=o, x=3 about the x-axis.

*May 2, 2012 by carlton*

**Calculus**

Find the volume or the solid generated by revolving around the region bounded by the graphs of the equations about line x=6. xy=6, y=2, y=6, and x=6

*May 28, 2012 by Christina*

**Chemistry**

Write equations for the ionization of the following acids.Which ones ionize only slightly? (a) HF (b) H2SO3 (c)CH3COOH (d) HNO3

*December 5, 2012 by Guy*

**math**

How do i solve algebraic methods in addition/ subtraction problems such as rewriting the following equations in standard form. 5x + 4 = -9y

*December 10, 2012 by Antrinique*

**Chemistry**

Using chemical equations, show how the triprotic acid H3PO4 ionizes in water. Phases, such as (l) or (aq), are optional.

*January 26, 2013 by Debbie*

**Chemistry**

Using chemical equations, show how the triprotic acid H3PO4 ionizes in water. Phases, such as (l) or (aq), are optional.

*January 27, 2013 by Jessica*

**Solving linear equations**

Is there a formula to following or pattern. This is very new to me and I am having issues with these type of problems, please help

*February 8, 2013 by heybaby*

**math**

How do you write a system of linear equations in two variables? Explain this in words and by using mathematical notation in an equation.

*February 12, 2013 by taylar*

**Chemistry**

Using chemical equations, show how the triprotic acid H3PO4 ionizes in water. Phases, such as (l) or (aq), are optional.

*March 26, 2013 by Anonymous*

**Calculus**

Determine whether the planes are parallel or orthogonal. Equations given: 5x - 3y + z = 4 x + 4y + 7z = 1 How exactly do I solve this? It wasn't covered completely in class.

*April 8, 2013 by Krista*

**calculus**

A circle is formed with a center (-3, 5) and a radius 4 write a pair of parametric equations then show how to return to rectangular form

*April 26, 2013 by brady*

**chemistry**

balance half equations in basic solution ClO3- to ClO4- Zn to zn2+ BrO3- to Br- IO3- to I2 Sn2+ to Sn4+

*July 26, 2013 by roxy*

**Chemistry Check?**

Balance Chemical Equations; 1. C2H6(g)+O2(g)---->H2O(g)+CO2(g) Answer: 2C2H12(g)+2O7---->H12O6+2C2+O8

*August 27, 2013 by Unknown*

**maths**

find equations for the tangent and the normal at P (1n2, 2k) on the curve with equation y=ke^x, where k is a constant. (b) given that y=sin^-1x, show that (1-x^2)d^2y/dx^2-xdy/dx=0

*October 3, 2013 by skangele*

**maths**

find equations for the tangent and the normal at P (1n2, 2k) on the curve with equation y=ke^x, where k is a constant. (b) given that y=sin^-1x, show that (1-x^2)d^2y/dx^2-xdy/ dx=0

*October 6, 2013 by gibbsm*

**math 9**

Identify the solution(s) of the system of equations, if any. 3x-2y=6 5x=5-25y A) (28/13, 3/13) B) (-3/17, 32/17) C) (32/17, -3/17) D) (32/9, 7/3) I think the answer is D but i did my check and still comes out incorrect

*October 20, 2013 by sam*

**Chemistry**

Complete and balance the precipitation reactions. Include physical states in your equations. Ba(NO3)2(aq) + CuSO4 (aq)---> K3PO4(aq)+MgCl2 (aq)---->

*November 9, 2013 by Jake*

**chemistry**

Complete and balance the precipitation reactions. Include physical states in your equations. Ba(NO3)2(aq) + CuSO4 (aq)---> K3PO4(aq)+MgCl2 (aq)---->

*November 11, 2013 by lauren*

**chemistry**

By using the method of neutralization the acidity of the bee sting can be neutralized. What is the underlying principle and what are the chemical equations involved.

*January 28, 2014 by kim jung hee*

**Math**

Show all the ways of breaking apart 8/8 write the equations next to each array and draw a line to separate it.

*February 5, 2014 by Anonymous*

**Chemistry**

Write the total and net ionic equations for the following molecular reaction: HgNO3 (aq) + NaCl (aq) -> HgCl (s) + 2 NaNO3 (aq)

*February 20, 2014 by Ellen*

**Math**

How do you write a system of linear equations in two variables? Explain this in words and by using mathematical notation in an equation.

*April 19, 2014 by Felicia Chase*

**Pre-Calculus/Trigonometry**

Solve the following system of equations algebraically. Verify the solution by using matrices. 8x-2y=5 -12x+3y=7

*September 30, 2014 by Anonymous*

**pre - CALCULUS**

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. x + y + z = 9 2x - 3y + 4z = 7 x - 4y + 3z = -2 A. {(-7z/5+34/5 ,2z/5 +11/5 , z)} b. {(- 7z/5+34/5 , 2z/5- 11/5 , z)} c . {( z/5+ 34/5 , 2z/5+11/5 , z)} C?

*April 11, 2015 by Ciara*

**pre-calc - JAI**

Solve the system of equations using matrices. Use Gaussian elimination with back- substitution. x+y+z = -5 x-y+3z = -1 4x+y+z = -2

*April 17, 2015 by Ciara*

**Logarithms**

Solve the following equations for x and check the solution using log. 2^6x-1 = 28 The answer is log56/6log2. Explain each step.

*November 7, 2015 by Bobby*

**Chem**

How were each of the following cations utimately separated from the rest of the group and /or decorated? The use of equations may be helpful, where applicable. Ag+ K+ Nh4+ Al+

*November 14, 2015 by Elena*

**Chem**

How were each of the following cations utimately separated from the rest of the group and /or decorated? The use of equations may be helpful, where applicable. Ag+ K+ Nh4+ Al+

*November 15, 2015 by Elena*

**math**

Identify the direction of opening,the coordinates of the center, the vertices, and the foci. Find the equations of the asymptotes and sketch the graph. x^2/16-y^2/9=1

*December 7, 2015 by CEED*

**math**

Graph two equations to determine every real number whose square equals its cube. I am so confused!

*February 1, 2016 by Cindy*

**math**

Solve the system of equations algebraically. Show all your steps. y=x^2+2x y=3x+20 Can someone pease help me? I don't think I'm right. Would it be x=-4, y=8 Then, x=5,y=35??

*April 12, 2016 by Mina*

**Math**

How many solution are there in the following system of equations? x=-6y+4 2x+12y=8 Please help me and explain it to me! I would really appreciate if you guys answered it!

*May 23, 2016 by Helen*

**Math (Parametrics)**

Find the parametric equations of a unit circle where you start at point (0,1) at t=0 and you travel clockwise with a period of 2π? x(t)=? y(t)=?

*June 3, 2016 by Ray*

**Math**

Hello, I need help solving two systems of equations. I'm not sure how to solve them. They are: 7w+e=8 e+5=9 And the second one is: 7e=107-6d 7e+8d=117 Thanks!

*September 8, 2016 by Julie*

**Gaussian Elimination Method**

Is my answer correct? Write the system of equations as an augmented matrix. Then solve for x and y. −4x−y=6 12x-2y=-8 Solution = -1,-2

*November 23, 2016 by plummer*

**pre calculus**

Use Gaussian elimination to write the system of equations given below in row-echelon form 2x+4y+z=-4 2x-4y+6z=13 4x-2y+z=6

*November 29, 2016 by Anonymous*

**pre calculus**

Use Gaussian elimination to write the system of equations given below in row-echelon form. 2x+4y+z=-4 2x-4y+6z=13 4x-2y+z=6

*November 30, 2016 by Anonymous*

**Calculus - Second Order Differential Equations**

Posted by COFFEE on Monday, July 9, 2007 at 9:10pm. download mp3 free instrumental remix Solve the initial-value problem. y'' + 4y' + 6y = 0 , y(0) = 2 , y'(0) = 4 r^2+4r+6=0, r=(16 +/- Sqrt(4^2-4(1)(6)))/2(1) r=(16 +/- Sqrt(-8)) r=8 +/- Sqrt(2)*i, alpha=8, Beta=Sqrt(2) y(0)=2...

*July 10, 2007 by COFFEE*

**Mathematics**

Ellen is 11 years older than Maja. Last year Ellen was twice as old as Maja. How old is Maja now?

*May 13, 2013 by Anonymous*

**Probability**

The letters in the word MATHEMATICS are arranged randomly. What is the probability that the first letter is E? Preview What is the probability that the first letter is M?

*March 25, 2016 by Samuel*

**mathematics**

my tenths digit is 3 times greater than my thousandths place.my hundredths digit is the sum of my tenths and thousandths digit, who am i?

*June 19, 2016 by bhea*

**concept development**

Which of the following is not a reason to make mathematics and science instruction relevant? A. To protect schools from being sued for discrimination B. To consider diversity in race, ethnicity, social class, and gender C. To build on concepts that children learn before they ...

*January 24, 2015 by Daniella*

**mathematics**

4x to the power 2 upon 3 + 5x to the power 1 upon 3 minus 6 = 0

*February 3, 2016 by cleo*

**statistics**

The average marks of 30 students in mathematics is 69. If the class leader’s mark is included then the average becomes 70. Find the class leader’s mark.

*July 25, 2011 by Sharon*

**mathematics**

given tanθ= -2√10/3 and π/2<θ< π find: a.sin2θ b.tan θ/2 could some1 help me with these 2 they're the only ones i couldn't get

*November 21, 2011 by Yuli*

**Mathematics**

the scale on a map is given as 1:2000000. the distance between two towns on the map is 4.3. what is the actual distance between the towns in cm (squared)?

*May 6, 2013 by Calvin*

**mathematics**

In an ap d sum of d 1st ten terms is 50 nd d fifth term is 3times the 2nd term.find the first nd d sum of d 1st 20 terms

*December 1, 2014 by brown*

**Mathematics 2**

The sum of a two digit number is 6. The number with the digits interchanged is 3 times the tens digit of the original number. Find the original number.

*December 2, 2015 by Sylvestre*

**Mathematics**

France is twice as old as his brother Emma.the sum of their age is less than their father by 12 years.if the father is 30 years.how old is Emma

*November 21, 2016 by Asam*

**mathematics**

France is twice as old as his brother Emma.the sum of their age is less than their father by 12 years.if the father is 30 years.how old is Emma

*November 21, 2016 by Asam*

**Algebra**

Can someone show me step by step how to do this problem to have an example to go by so I will be able to do my other problems. Thanks Solve by substitution 4x-12y=5 -x+3y=-1 I know that you have solve one of the equations. I have picked the second one so it would be y= -1/3+1/...

*May 6, 2007 by jessica*

**Math Fractions**

Nadia 4/9 h to complete her Language Arts homework and 2/9 h to complete her mathematics homework. Which takes longer? How much longer? I just need to know am I right or wrong? I calculated Wednesday to have 3 inches of snow. Which is 2 inches more than Sunday. Thank you.

*December 26, 2012 by Matty*

**Applied Mathematics ( Mechanices**

A mass of 50 kg is moved vertically upwards by a rope. find the tension in the rope when: (a) the mass moves with constant velocity of 3ms-1 (b) the mass accelerates up wards at 5ms-2 (c) the mass accelerates downwards at 5 ms-2 I couldn't manage this question in no way. ...

*July 2, 2015 by Babita*

**Mathematics,Science(physics,chemistry and biology)**

Two similarly charged identical ping pong balls are suspended from the common support with the help of two threads.Calculate angle between the two threads and also calculate the tension in two strings.

*January 25, 2016 by Shâhîd*

**mathematics-need help urgently please**

A tank with a square base of side x has a capacity of 1000m^3. If the total area is pm^3, show that p=2x^2+4000/x. Hence find the least area of the flat sheet that may be used to build the tank. Please show workings #thanks

*April 17, 2016 by P1*

**Chemistry**

Analysis of Tap water (Hardness) 50.00 mL of tap water was transferred to a 250 mL erlenmyer flask. 10mL of NH3/NH4^+ ph 10 buffer was added to the flask, as well as 6 drops of eriochrome black T indicator. This soln was then titrated with EDTA soln(0.00641M) Given equations: ...

*November 29, 2009 by Lauren--PLEASE HELP*

**Maths**

What are bearings? Bearings are things that surround rotating shafts to reduce friction and wear. The word "bearing", as in compass bearing, can also refer to the direction that something is moving (such as 10 degrees east of north). I have heard of no meanings of the word ...

*July 1, 2007 by Fred*

**mathematics**

the 1st term of arithmetic series is 2 .the 1st ,3rd and 11th terms are the first the terms of a geometric series. find the 6 terms of the arithemetic series

*March 14, 2013 by cebile*

**Algebra II**

ok now this is an algebra 2 problem... I have goten far down to hear e^(ix) = (4i +/- 3)/5 now how do I solve for x I feel really stupid now as this is algebra 2... can't use natural log right or the common log as ln( e^(ix) ) does not equal ix so what do I do?

*July 20, 2010 by Kate*

**School-Age Children**

You're trying to plan an activity for your third graders, who will be arriving around 2:30 in the afternoon. Today you want to do something associated with mathematics. Which one of the following activities would be appropriate? A. Keeping track of the weather B. Making a ...

*March 15, 2009 by Cynthia*

**algebra**

Do you like roller coasters? If you were asked to design a roller coaster, what would it look like? Would it have steep hills? Would you design the tracks to go upside down? Did you know that polynomial equations are used by the structural engineers who design roller coasters ...

*April 16, 2013 by Gina*

**physics**

Derive a general equation for the time of flight of the banana en route to the monkey in terms of only the velocity, distance, and height hint: if you are doing everything right, there should be a lot of cancellations resulting in a relatively simple solution Okay, this is ...

*October 25, 2015 by Spice*

**college mathematics**

how do I set up an equation for this? Lisa has $215 saved. She plans to save $125 every month so that she can have enough money to buy a new sofa. The sofa costs $1498, including tax. How many months will she need to save to be able to buy the sofa?

*August 11, 2010 by Madison*

**Mathematics**

Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the earth in miles ...

*October 24, 2016 by Sal*

**Algebra/Math**

Can you check these for me. Directions: Find the slope of the line that passes through each pair of points. 1. (3,-8) and (-5,2) Answer: -10/8 2. (-10,-3) and (7,2) Answer: -5,-17 3. (-7,-6) and (3,-6) Answer: 9 4. (8,2) and (8,-1) Answer: 0 undefined Directions: State whether...

*October 17, 2010 by Karen*

**MATHS**

Mrs.Koh purchased new books for the school library, of which 6 were Mathematics books, 7 were Science books, 10 were Music books, 3 were Art books, and 4 were social studies books. All of these books were different. She picked a book from each subject to display in a row on a ...

*April 30, 2013 by RS*

**Geometry HELP**

1.) Given points A(-4, 5), B(2, 3), C(0, 4) and D(5, 0), decide if AB and CD are parallel, perpendicular or neither. 2.)Given the equations y = 1x + 7 and y = 3x - 2, decide whether the lines are parallel, perpendicular or neither. 3.) Given the equations y = 4/3x - 3 and y...

*June 8, 2010 by Ariel*

**Finite Mathematics**

If a merchant deposits $1,500 annually at the end of each tax year in an IRA account paying interest at the rate of 10%/year compounded annually, how much will she have in her account at the end of 25 years? Round your answer to two decimal places

*June 6, 2013 by Reco*

**Mathematics**

Karen collects local and foreign coins. 1/4 of her coins. 2/9 of the foreign are Austalia coins. What fraction of the coins are non-Australia foreign coins?

*April 1, 2015 by xr*

**Sj**

Mathematics......Under number patterns-Geometric series If a question goes.determine the expression for the nth term of the following sequence if the a) 4th term is 24 and the 7th term is 192 in a geometric sequence.what formula do i use here?because i don't have the whole ...

*July 16, 2015 by Mahlogonolo*

**Algebra**

Lydia wants to buy picnic tables, benches, and permanently installed grills. On one page she notices that 5 picnic tables, 10 benches, and 3 grills sell for $1330. On another page she sees that 20 picnic tables, 30 benches, and 20 grills sell for $5550. Finally, on a third ...

*October 14, 2009 by (:*

**pre cal**

What is the center of the conic whose equation is x^2 + 2y^2 - 6x + 8y = 0 2.Which one of the following equations represents a hyperbola? (5 points) A) 3x^2 + y^2 + 12x - 7 = 0 B) 3x^2 + 3y^2 + 12x - 7 = 0 C) 3x^2 + y + 12x - 7 = 0 D) 3x^2 - 3y^2 + 12x - 7 = 0 E) x^2 + y^2 + ...

*April 16, 2012 by Mecie*

**Basic Mathematics**

A bag contains 2 red balls, 3 blue balls and 5 green balls. 3 balls are drawn at random. Find the probability that a) the 3 balls are of different colours b) 2 balls are of the same colour c) all the 3 are of the same colour.

*May 23, 2014 by Shammi*

**algebra 1**

Jacob spends 60 minutes in the gym every day doing freehand exercises and running on the treadmill. He spends 30 minutes more running on the treadmill than doing freehand exercises. Part A: Write a pair of linear equations to show the relationship between the number of minutes...

*January 4, 2016 by Meredith*