Tuesday

December 1, 2015
Number of results: 41,771

**Math(Algebra 1)**

What are the basic properties of algebra. How do you justify steps?
*September 18, 2007 by Siri*

**algebra**

What is Algebraic reasoning? How are repeated patterns connected to algebra?
*March 23, 2008 by Ashley*

**algebra help**

Hello, I need help figuring out this algebra problem. If x=7 and y=-2 then x-3y= thanks
*October 11, 2008 by Brooke*

**Algebra I**

What is the answer to Algebra with pizzaz p.93 How Can Fisherman Save Gas?
*March 2, 2009 by Chris*

**Algebra**

what is the development of algebra during the year 1200-1400?
*October 4, 2009 by Mildred*

**algebra**

this is not algebra. I just need to know how to find a percentage of something.
*November 30, 2009 by Chris00*

**algebra**

make up situation that can be described in algebra with each expression for 5x, and for x-10, and also 2x+3
*May 19, 2010 by sandy*

**algebra 2**

how do you creat a number games for algebra i dunno how to do that? help please
*June 15, 2010 by at*

**Algebra**

Homework help please: algebra inequality 0.3 - 0.5n + 1 is greater than or equal to 0.4
*October 11, 2010 by Lisa*

**Algebra. **

I'm in 8th grade, im in algebra, and this is my question: x=a+b+c ----- ab solve for a. please help!!
*October 25, 2010 by Maddison*

**algebra**

i do not get algebra at all so tell me what is 4x4x4x4 in the index notation
*November 6, 2010 by ryan*

**algebra**

what is the answer to pre algebra with pizzazz page 106
*May 6, 2012 by Anonymous*

**algebra**

Translate to algebra One half of a number decreased by 16
*September 8, 2015 by pppppp*

**Statistics**

Your mathematics instructor claims that, over the years, 88% of his students have said that math is their favorite subject. In this year's class, however, only 21 out of 32 students named math as their favorite class. The teacher decides to conduct a test of the hypothesis H0...
*October 26, 2012 by Oops*

**college mathematics**

9. Create a Euler diagram to determine whether the syllogism is valid or invalid. All children like games. John likes games. John is a child., <--At the beginning of this sentence which is the last sentence is suppose to have three dots shaped like a triangle. (I am having ...
*February 8, 2012 by cody*

**math**

Determine which tow equations represent perpendicular line. (a) y= 3/8 x -4 (b) y= 4x - 3/8 (c) y= - 1/4 x + 3/8 (d) y= 1/4 x - 3/8 b and c. Perpendicular lines have slopes which are negative reciprocals of each other. So 4 and -1/4 work.
*May 26, 2007 by Dee*

**ib math studies**

i need a project idea for the internal assesment project. I want it to do something with sewing, like using equations in making a garment.
*October 29, 2007 by Yousra*

**math**

THIS IS SYSTEM OF EQUATIONS:SUBSTITUTON Y=2X-8 X-Y=2 I KNO THAT U COMBINE SO IT WILL BE X-2X-8=2 WHICH WLL BE 3X-8=2 BUT I DON'T KNO HOW TO FINISH TH REST......CAN SOMEONE HELP ME....... IF DID SOMETHING WRONG PLEASE TELL ME
*October 25, 2008 by kris*

**Chemistry**

1. Al + Pb(NO3)2 ----> Al(NO3)3 + Pb 2. FeS + O2 ----> Fe2O3 + SO2 3. C3H8 + O2 ----> CO2 + H2O I need some help balancing these equations. Thank you very much!
*February 17, 2009 by Momo*

**Advanced Functions**

A rectangle has perimeter 64cm and area 23cm squared. Solve the following system of equations to find the rectangle's dimensions. l=(23/w) l+w=32
*October 24, 2009 by Anonymous*

**chemical equations**

5C(s) + 2SO2(g) > CS2(l) + 4CO(g) How many moles of carbon monoxide form at the same time that 0.246 mol CS2 forms?
*February 7, 2010 by Tristan*

**Geometry**

Consider again the sphere of radius 5 centered at (2, 3,−6). Describe the intersection of the sphere with the xz-plane. Write an equation (or equations) for this curve.
*April 17, 2010 by Yadlay*

**Pre Calc**

1) How do you analyze this function: 11x-2y=0 2) Find the equations of the lines to the line whose equation is y-7 -3 ---- = ----- x-13 2 if these lines pass through the point (6,-5)
*April 25, 2010 by Reema*

**math **

given the following equations x,y data pairs find the least squares equation fo these data. use 3 decimal places. Y equals what + what x (3,3)(4,5)(6,8)
*January 19, 2011 by jeffrey *

** Electrical **

Given the following system equations: -Put them into Standard Form, and -Simplify using Cramer’s rule IS + G1 (VA + VB) – G2VB = 0 G2VB + G1 (VA – VB) = 0
*March 12, 2011 by Chris Williams*

**science**

A skateboarder initially traveling at 1.8 m/s accelerates at a rate of 1.5 m/s squared for 2.5 s. How far does the skateboarder go in this time? What is the equations used, variable solving for, and of course the solution.
*April 21, 2011 by Anna*

**lab science 9th grade**

what is an easy way to remember the equations used for: kinetic energy, potential energy, work, and power?
*April 22, 2011 by caylanne*

**chemistry**

Use the bond enthalpies and bond energies in the data book in themochemical equations to calculate the reaction enthalpy of: H2(g) +Br2(g) -> 2HBr(g)
*July 11, 2011 by Gift*

**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*

**Liinear equations**

Write the equation for this situation the value,V in hundreds of dollars of Bob's stamp collection is 12 dollars more than 1/3 of the age, t(in years)
*March 1, 2012 by Glenn*

**Calculus & Vectors**

Sketch the sets of complex numbers that would satisfy the following equations. a)z=2 b)|z|=2 c)(5,4) d)(sqrt2, -sqrt2) Also, please explain how to do it. Thanks.
*September 28, 2013 by Rayne *

**PreCal**

Determine the value of c for which the following quadratic equations will have one root. x^2-5x+c=0 I have no idea what formula to use to figure this out.
*November 10, 2013 by Terri*

**Alegbra**

. Rachel has 15 coins with a value of $2.85. If the coins are either dimes or quarters, how many of each coin does she have? Write and solve using a system of equations.
*February 27, 2014 by EddieG*

** Precalculus II**

Find the inverse of: f(x) = -5 +11arccos(7^x - 9) Find exactly all the real solutions for each of the following equations. a. Sin(x) = - square root 3/2 b. 1 + cos(3x-pi/4) = 1/2
*March 11, 2014 by hfx*

**calc**

Give the equation of a plane containing the points (1, 0, 0) and (1, 2, 1) and parallel to the line whose equations are x = y, z = so i found n to be <0,1,2> then i used the equation n(r-ro) and got y-x+2z. the answer is x-y+2z =1. how do they get =1 and why is it x-y ...
*December 7, 2014 by rebecca*

**Solving Linear Equations (Math)**

The length of a rectangle is 5m shorter than three times the width. The perimeter is 46m. Find the length of each side.
*September 24, 2015 by Andrea*

**Math**

the perimeter of a rectangular garder is 100 feet the length of the garden is 8 feet longer than twice the width I need 2 linear equations
*November 16, 2015 by Anonymous*

**Mathematics**

A shopkeeper mixed coffee powder worth $2.50 per kg with coffee powder worth $3.50 per kg, and sold 20 kg of the mixture at $2.80 per kg. Find the weights of the 2 grades of coffee powder that he mixed together. Explain clearly your steps of solving it.
*January 15, 2012 by James*

**mathss**

How do i solve the following equations giving the answers either exactly or to 3 significant figures? a)3x + 5 = 2x – 1 b)(x^2 + 9) / 2 = 10 c)x^2 = 4 (x – 1) d)2^x = 5 e)3^x+1 = 7 What do you not understand about thse euqations. They seem pretty simple. Please be dtailed.
*August 13, 2007 by kat*

**Solving system of linear equations**

I already know the 3 methods of doing it, but I recently found out about using matrices to solve it. How exactly do you do that? All I can remember is something with rref on my calculator.
*February 22, 2009 by Chopsticks*

**Quadratic Equations**

Find two consecutive integers, the sum of whose squares is 1 more than twelve times the larger. (Please provide the steps/explanation for solving this problem)
*March 29, 2009 by purpletree*

**Chemistry**

In the following equations determine which reactant is the limiting and which reaactant is in excess. 1. KCL + HNO3--->KNO3 + HCL 22.0g 18.3g 2. 2Al(OH)3 + 3H2SO4---> Al2(SO4)3 + 6H2O where there is 25 g of Al(OH)3 and 25g H2SO4.
*August 3, 2009 by Ashley*

**Pre-Calculus**

I have to use the substitution method to solve the system of equations. 4x-y=9 and 2x+3y=12 I worked this problem myself and could not find a possible solution. So I put that it is inconsistent. Is that correct? If not could you please help me?
*January 22, 2013 by Caroline*

**CHEMISTRY**

Guys i really need help in these three problems. If someone could explain how to do this i would appreciate it! complete and balance the following equations 1. SO3^2- + Cu^2+ --> SO4^2- + Cu^+ 2. Cr +Cu^2+ ---> CrO4^2- + Cu^+ 3. MnO2 + Ag^+ ---> MnO4^- + Ag
*February 14, 2012 by Keisha*

**chemistry**

for these chemicals write complete balanced equations for all possible reactions that would lead to an insoluble salt KCL BaCl2 AgNO3 Pb(NO3)2 K2SO4 HNO3
*September 30, 2012 by Anonymous*

**AP Chemistry**

Use the oxidation number method to balance the following equations by placing coefficients in the blanks. Identify the reducing and oxidizing agents. _I2+_Na2S2O3-->_Na2S4O6+_NaI
*October 26, 2012 by Anonymous*

**chemistry**

Predict the prdeucts of the following acid/base and precipitation reactions and balance the equations. Remeber to indicate (s), (l) or (aq Q1. HCI(aq) + Mg(OH)2(aq)----> Q2. Pb(NO3)2(aq)+ Na2S (aq)---> Q3. write the ionic equation for question 2.
*March 2, 2014 by Kay*

**Physics**

How far will a motorcycle driven by Emily travel, if it is initially moving at 14.8 ft/s and accelerates uniformly at 11.3 ft/s2 for 6.6 seconds? My teacher never gave us equations to use when solving this king of problem.
*October 21, 2014 by Adub*

**Chem**

Slats such as barium chromate and calcium oxalate are generally insoluble in water. The addition of his enhance their solubility. Explain why.use chemical equations to highlight your arguments.
*November 14, 2015 by Ana*

**7th Grade Math 123**

Write one or two equations to represent the situation below. Solve the equation(s). Show all your work. A collection of dimes and quarters totals 72 coins. Together the dimes and quarters are equal to $11.70. How many of each coin are in the collection? 2 and 6 tenths? Can you...
*November 7, 2006 by Danny*

**Math/Algebra**

At Gwen's garage sale, all books were one price, and all magazines were another price. Harriet bought four books and three magazines for 1.45, and June bought two books and five magazines for 1.25. What was the price of a book and what was the price of a magazine? Let x be the...
*July 24, 2007 by Bianca*

**Geometry**

1. Explain whether the following statement is a valid definition: “A 150° angle is an obtuse angle.” Use the converse, biconditional, and at least one Euler diagram to support your answer. 2. Explain the purposes of inductive and deductive reasoning in mathematics. Be sure to ...
*December 9, 2010 by Julie*

**algebra honors**

I was placed into algebra honors instead of advanced math.. I am in 7th grade.. I have to maintain an 80% for the entire year or go to virtual school all summer.. My question is: Is there a special technique, formula, or very useful site that might help me grasp the concepts ...
*October 5, 2010 by Jarrad*

**Mathematics**

The formula Total cost = Cost + Shipping cost - Holding cost is used to find the total cost of a business asset. The formula can be written in symbols as T=C+S+H. Solve the formula for C, the the cost of the asset. C=
*December 17, 2013 by Abby*

**college mathematics**

In exercises 59-62,let p: Tanisha owns a convertible. q: Joan owns a Volvo. Translate each statement into symbols. Then construct a truth table for each and indicate under what conditions the compound statement is true.#62 Tanisha does not own a convertible or Joan does not ...
*February 3, 2012 by cody*

**statistics**

Suppose scores on the mathematics section of the SAT follow a normal distribution with mean 540 and standard deviation 120. ACT math scores are normally distributed with a mean of 18 and a standard deviation of 8. What score on the ACT is equivalent to a score of 750 on the SAT
*September 15, 2013 by Anonymous*

**Mathematics **

two brothers Peter and Paul owns a store. if there share ratio of store value 3 ratio 5, later peter sold 2/3 of his share to Paul for 8000 naira. what is the value of the goods in the store.
*September 30, 2015 by Joshua *

**Honoirs Algebra**

Hello - I am afreshman & honors algebra is kicking my butt - I need to simplify the following (-6c)(2-3c) can some on help
*October 1, 2007 by Eddie*

**Algebra 1A**

Enrichment Exercise Life Expectancy MAT 116 – Algebra 1A I need help solving the answers for this assignment
*December 18, 2009 by C-GUTTER*

**algebra**

I am greater than 15 and less than 40 If you double me I become a number that ends in 0 and of me is equal to 5 [Click to preview algebra format]
*March 16, 2010 by Chelsea*

**Algebra**

Algebra with Pizzazz need help with the riddle When Do Sky Drivers Use Decimals I have in a tent is satuasion?????
*August 22, 2010 by Rayne*

**mathematics**

A retail jeweler sells a pair of gold earrings for $213.90. The jeweler uses a 130% markup based on cost. Based on this information, what was the wholesale cost of the earrings? A. $93.00 C. $276.90 B. $164.53 D. $278.07 213.90 divided by 130%=164.53 B
*May 14, 2009 by Emma*

**Maths**

A total of 80 pupils take part in a mathematics test and the average score was 69 marks. Given the average score of the boys was 75 marks and the average score for the girls was 65 marks. find the number of boys who took the test.
*May 10, 2015 by Isarah*

**Algebra 1**

So I attempted this and I'm not sure if it's the correct answer - and I don't know how to graph it.. Student tickets to the Homecoming game cost $5 each. General admission tickets cost $8 each. So far, 150 tickets have been sold. $900 has been collected. A. Write a system of ...
*September 16, 2014 by lost*

**Mathematics**

Hi, Can someone check this for me .. please A tuning fork has a wavelength 0f 136 centimetres. Given that the speed of sound is 340 metres per second what is the frequency of the tuning fork ?? Frequency = speed / wavelength Then 340 / 1.36m (136cm) = 250 Hz Thank you try to ...
*May 28, 2011 by Alan*

**mathematics**

The circle x2-2x+y2-4y-4=0 lies on the cartesian plane,question 2.1.1 equation of new circle which is the rotation of original circle through 180 degree around the origin...2.1.2 find equation of another circle which is the translation (x;y)-(x-8;y-6) of the points of the ...
*March 21, 2013 by Jossie*

**mathematics**

the cross section of a solid in the form of a cone of height h, and a hemispherical bowl of radius r. the volume of the hemispherical portion is half that of the conical portion. calculate: 1)the ratio r:h 2)the vertical angle of the cone, correct to the nearest degree. 3)the ...
*April 5, 2013 by jolomi*

**mathematics word problems**

Club members wrote a program together, with several people working on each of 4 parts. If the first part of the program required 1/3 of the total time, the second part needed 1/2 of the remaining time, the third part took 30 minutes, and the fourth part took 60 minutes, how ...
*August 7, 2014 by Epson*

**Teachers Aide/Language and other Barriers**

12. The best way for a school to demonstrate multicultural awareness is to A. host special “ethnic” or “diversity” student assemblies. B. include multicultural content in as many subject areas as possible—in mathematics, science, etc. C. celebrate ethnic or cultural holidays ...
*September 25, 2010 by AspiringTeacherandMotherofFour*

**Finite Mathematics**

Two dice are rolled. Let the random variable X denote the number that falls uppermost on the first die and let Y denote the number that falls uppermost on the second die. (a) Find the probability distributions of X and Y. (b) Find the probability distribution of X + Y. x + y 2...
*April 18, 2012 by Price*

**mathematics **

A rectangular house with 60*50 feet dimension has a rectangular wall surrounding the garden around the house.the area of garden is same as area of house.so how far is wall from the house?
*June 30, 2014 by Akash *

**mathematics **

Ginger earns $18,500 annually and has 22% of her gross earnings withheld. What is the net amount of her paycheck each pay period if she is paid biweekly? 2)Zack deposited $1,200 in a savings account that paid 7.75% simple interest. What was the balance in his account at the ...
*February 1, 2010 by gbe*

**Stats Repost**

Your mathematics instructor claims that, over the years, 88% of his students have said that math is their favorite subject. In this year's class, however, only 21 out of 32 students named math as their favorite class. The teacher decides to conduct a test of the hypothesis H0...
*December 17, 2012 by Oops*

**math**

What is the definition for an EXPRESSION ? An expression in English can be a short sentence, or a sentence fragment. Take a hike. Go figure. What's up? Whatever. In math, an expression is again a fragment, it can be complete or not complete. 2x + 1 Sin^2(2x) + 2 e^(2x + ...
*September 19, 2006 by gio*

**pre-calculus**

Solve eacy system of inequalities. If the system has no solution, say that it is inconsistant. x -y -z = 1 2x +3y +z = 2 3x +2y = 0 add the top two equations. 2x+2y =3 That is inconsistent with the last equation.
*October 24, 2006 by Erica*

**Mechanics**

How do you dereive equilibrium equations for a 2-D pi/3 section of a circle in polar coords? There are stresses & shears. (Eight total, one stress & one shear on each side)
*September 29, 2007 by Brian*

**Differential Equation**

Hello everyone. I was wondering if anyone knows a site that could help me with the homework free online...with Differential equations. it would be great. I need help on in big time thank you
*October 22, 2008 by mary*

**calculus**

is y = x^3 a solution to the differential equation xy'-3y=0?? how do i go about solving this??? also, is there a trick to understanding differential equations? i'm really struggling with this idea, but i'm too embarassed to ask my professor for help.
*December 1, 2008 by Kenneth*

**chemistry**

I don't understand net ionic equations; for example, when you're given Pb(NO3)2(aq)+2LiCl(aq) how do you know that in the product Pb has to be paired with Cl2 and Li with NO3 to make PbCl2(s)+2LiNO3(aq)?
*January 7, 2009 by GP*

**chemistry: equations and reactions**

identify the products when the following substances decompose: 1) binary compoound 2) metallic hydroxide 3) metallic carbonate 4) the acid H2SO3
*February 12, 2009 by Stephanie*

**chemistry**

Write the complete balanced molecular, ionic,and net ionic equations for the reaction of nickle II chloride + sodium phosphate. Which product,if any, is a precipitate?
*December 3, 2009 by LaLa*

**Calculus**

"Find the volume of the solid generated by revolving the region bounded by the graphs of the given equations about the indicated lines: y = 2x^2 y = 0 x = 2 About the line y = 8"
*April 18, 2010 by Stuck*

**college differential equations**

Find two linearly independent power series solutions to the diffrential equation. State the first 3 therms of each series: 2x^2y''+xy'-(1+2x^2)y=0
*July 28, 2010 by Justin*

**math/equations**

Hi. I am having some issues with this one. Give the equation of the line that is perpendicular to the line y=x+6 and passes through point (0,-4). Thank you so very much!!!
*July 29, 2010 by amy*

**Math**

What does it mean if a line in R^3 is parallel to the xy-plane but not to any of the axes. I really don't know what this means in terms of how the parametric and symmetric equations of the line should look. Please help.
*October 27, 2010 by Kate*

**Math**

What does it mean if a line in R^3 is parallel to the xy-plane but not to any of the axes. I really don't know what this means in terms of how the parametric and symmetric equations of the line should look. Please help.
*November 2, 2010 by Kate*

**calculus**

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations and/or inequalities about the indicated axis. x = y(25 − y2)^1/2 x = 0 the y-axis
*February 2, 2011 by Morgan *

**Andy**

Name: Lesson 3 Assignment.Instructions Explain the differences between solving these two equations: •log3(x - 1) = 4 and log3(x - 1) = log34. I think it has to do with the formulas
*February 8, 2011 by andy*

**Chem**

Write the balanced net ionic equations for the reaction of a) added H+ and B) added OH- with the components of the acetic acid/sodium acetate buffer solution:
*February 9, 2011 by Bubba*

**Maths**

Basically there is this graph with the equations: x = cos t + 2 sin t and y = sin 2t (o<t<pi) I am asked to find the x-co-ordinates of A, B and D. All these points cross the x-axis, therefore y=0. How do I go about this?
*March 6, 2011 by Jennifer*

**in-organic chemistry**

provide balanced equations that represent the thermal decomposition of sodium nitrate and calcium nitrate; compare and comment on the products of each reaction.
*August 27, 2011 by bulelwa*

**precalc**

a circle is formed with a center (-3,5) and a radius.of 4 write the circle as a pair of parametric equations. then show how you can eliminate the parameter to return to the rectangular form
*April 26, 2013 by gggggg*

**biorganic**

equations of thereactions of both maleic acid and fumaric acid with (a) bromine (b) hydrogen chloride (c) catalytic hydrogenation.name the products of these reaction
*October 31, 2013 by debbie*

**Differential Equations**

Solve dy/dx = y/(2y-x) using rational substitution (using v=y/x) with the initial condition y(0)=1. I solved this problem and found C (the constant) to be undefined. That is not the correct answer.
*February 15, 2014 by Liz*

**Chemistry**

Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 2.640. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10. I need to know what equations to use to find the answer not just how to get it
*February 23, 2014 by Sonya*

**math (Matrix)**

solve the equations by using a) the adjoint matrix b) elementary row operations i) x+y+z=6 2x-y+z=3 x+4y-z=6 ii) 3p-3q+r=1 -3p+5q-2r=-1 p-2q+r=3 iii)-12a+b+17c=-14 2a-b+3c=5 8a+b-13c=-3 thanks sir/madam
*April 15, 2014 by shahira*

**maths (matrix)**

solve the equations by using a) the adjoint matrix b) elementary row operations i) x+y+z=6 2x-y+z=3 x+4y-z=6 ii) 3p-3q+r=1 -3p+5q-2r=-1 p-2q+r=3 iii)-12a+b+17c=-14 2a-b+3c=5 8a+b-13c=-3 thanks sir/madam
*April 15, 2014 by shiha*

**math (Matrix)**

solve the equations by using a) the adjoint matrix b) elementary row operations i) x+y+z=6 2x-y+z=3 x+4y-z=6 ii) 3p-3q+r=1 -3p+5q-2r=-1 p-2q+r=3 iii)-12a+b+17c=-14 2a-b+3c=5 8a+b-13c=-3 thanks sir/madam
*April 15, 2014 by MARYSE*

**Math **

Use back substitution to solve the system of linear equations x-2y+z=8 y+z=5 z=2 **I tried to solve it eventho im still confused/lost. 1=3 idk ugh
*June 17, 2014 by Anonymous*

**Math**

So I've been working on solving this system by addition/subtraction and I just can't get the right answer. Her is the system of equations I was given to solve by add/sub: 3x – y = –12 x + 2y = –18
*July 20, 2014 by jririfi*