Thursday

August 25, 2016
Number of results: 44,700

**Mathematics**

A bullet is found embedded in the wall of a room 2.9 m above the floor. The bullet entered the wall going upward at an angle of 36.7°. How far from the wall was the bullet fired if the gun was held 1.1 m above the floor?
*October 18, 2015 by harry*

**Algebra II**

An air show is scheduled for an airport located on a coordinate system measured in miles. The air traffic controllers have closed the airspace, modeled by a quadratic equation, to non-air show traffic. The boundary of the closed airspace starts at the vertex at (10, 6) and ...
*March 23, 2016 by Lashunda*

**Mathematics**

For the first 1 1/2 hours of a 91km journey the average speed was 30km/h.If the average speed for the reminder of the journey was 23km/h, calculate the average speed for the entire journey.
*July 20, 2009 by Lydia*

**Math**

The traditional method of determining the human age equivalent of a dog is to multiply its age by 7 years. The method we used in this project was to use equations based on scientific data to determine the human age of dogs. In my opinion, the _equations___________method (...
*March 9, 2016 by Anonymous*

**Mathematics (cumulative frequency**

The figures below show to t he nearest minute 80 students waited to be served in a canteen. Waiting time No. of students Cum.Freq 1-5 4 4 6-10 7 11 11-15 11 22 16-20 18 ? 21-25 22 ? 26-30 10 ? 31-35 5 ? 36-40 3 ? How do i find cumulative frequency??? Dont want all the answer ...
*June 17, 2009 by Maggie*

**math 12**

In Lisa's first-year college program she must take nine courses including at least two science courses. If there are five science courses, three mathematics courses, four language courses and five business courses from which to choose, how many different academic programs ...
*November 27, 2010 by kitkat*

**SCIENCE - Pls HELP**

A proton (with a mass, mp = 1.673 x 10^-27 kg & electrical charge, e = 1.602 x 10^-19) and an electron (with a mass, me = 9.109 x 10^-31 kg & electric charge -e = -1.602 x 10^-19) are not moving & at a distance of 1.000 x 10^-10 m apart.... (assuming the electrical constant, ...
*February 7, 2007 by OLIVIA*

**Mathematics**

Out of 18 times at bat, Jen got a hit 5/6 of the time and Kasa got a hit 8/9 of the time. 1) Who got more hits? 2) How many more?
*September 20, 2011 by Gian*

**mathematics**

A house was purchased for $67,000 After 7 years the value of the house was $130,000. Express the house's value V(t) in terms of time t in years.
*August 5, 2015 by jacqueline *

**Algebra**

The average mark on a test in an algebra class is 80. If the two lowest scores of 34 and 48 are not counted, the remaining scores would average 83. How many students are in the algebra class?
*October 28, 2010 by Rocky*

**MATH**

A student of MA101 is preparing a course schedule for the next semester. The student may select one of three mathematics courses, one of three science courses, and one of five courses from social sciences. How many schedules are possible? Please can you show me the anwer
*May 1, 2011 by sateko*

**Math**

When Albert flips open his mathematics textbook, he notices that the product of the page numbers of the two facing pages is 156. Which equation could be used to find the page numbers that Albert is looking at? a. x+(x+1)=156 b.(x+1)+(x-2)=156 c.(x+1)(x+3)=156 d.x(x+1)=156
*March 28, 2009 by Angie*

**Mathematics C 8th grade**

Two cars traveled equal distances in different amounts of time. Car A traveled the distance in 2.4 h, and Car B traveled the distance in 4 h. Car A traveled 22 mph faster than Car B. How fast did Car A travel? _______MPH
*October 3, 2014 by Destiny*

**algebra**

The volleyball team at West View High School is comparing T-shirt companies where they can purchase their practice shirts. The two companies, Shirt Box and Just Tees, are represented by this system of equations where x is the number of T-shirts and y is the total cost of the T...
*May 23, 2016 by joanne*

**Mathematics **

a cuboid with length 13cm width 4cm and height h State in terms of h the shaded face of the cuboid. write an expression in terms of h for the volume of the cuboid. if the volume of the cuboid is 286cm cube calculate the height h of the cuboid.
*May 2, 2012 by SAM*

**Mathematics**

A Pendulum 45cm long swings through a vertical angle of 30degrees. Find the distance of the altitude through which the pendulum bob rises. (I couldn't find this answer either :\ but can anyone please please help me! And if you can, can you also write the equation on how you ...
*March 5, 2008 by Nazharia*

**mathematics**

Please help me answer this question; 1.A metal gutter open at the tops and ends, is bent up from material 30 cm wide to form a rectangular cross section. a) If the base of the gutter is x cm wide, find the height of the gutter. b)Show that the area of the gutter cross section ...
*August 29, 2011 by Ruby*

**Health and science**

Explains the science, technology, engineering and/or mathematics behind a solar cooker that work day and night and how could a solar cooker that works day ajd night both address the everyday problems and have a broader impact locally or globally.
*January 19, 2016 by Anonymous*

**mathematics**

a ship which started at port p, sailed 15 km due south to port q , and then a further 20 km due west to port r. calculate pr , the shortest distance of the ship from the port where the journey started .
*March 1, 2014 by patrice*

**pre-calc**

solve each system of equations using matrices x+2y-3z=0 2x-4y=z=-7 -2x+2y-3z=4 I dont see how it is possible to even attempt a matrix on this text oriented site.
*October 24, 2006 by Erica*

**math**

solve the following system of equations algebraically or graphically for x and y: y=xsquare-6x+6 y-x=-4 For an algebraicc solution, show your work here. y=x^2-6x+6 y-x= -4 Let's substitute x-4 for y in the first equation. x-4 = x^2-6x+6 x^2 -7x + 10 = 0 (x-5)(x-2) = 0 x = 5 or...
*August 12, 2007 by Tashanna*

**MATH!!**

Find equations of both lines through the point (2, -3) that are tengetn to the parabola y=x^2+x i got the derivative as y prime = 2x +1, and i dont know where to go from there. PLEASE HELP this is due tomorrow!!!
*October 16, 2007 by Justin*

**Calculus**

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. y=ln x, y=0, x=1, x=3 Please show the steps in your work, thanks! :)
*March 27, 2008 by Sun*

**Calculus**

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. y=ln x, y=0, x=1, x=3 Please show the steps in your work, thanks! :)
*March 29, 2008 by Pan*

**Phy**

98N-T=10a T-18.89N=3a I worked on the problem and I end up getting two equations but now I have to find T and a. For some reason, I cant solve it. Thanks
*February 28, 2010 by Ana*

**Math**

solve the system of linear equations using the addition method. Can you please show me the steps on how you reached the answer. Thank You 2x+20y= -144 12x+5y= 56
*May 11, 2010 by Heather*

**math**

Find equations for exponential functions that pass through the given pair of points. (Round all coefficients to 4 decimal places if necessary.) (-2, 3) and (3, 4)
*October 7, 2010 by liz*

**Maths- Discriminants**

Find the values of k for which the following equations have 2 distinct roots. a)kx^2+kx+2=0 b)kx^2+3k+k=0 c)x^2-2kx+4=0 Im stumped please show working so i can see what needs to be done
*October 31, 2010 by Anonymous*

**Chemistry**

I am having some difficulties balancing the following equations: Cr2O3(s)+CO(g)->Cr(s)+CO2 Ca(OH)2(aq)+Na3PO4(aq)->Ca3(PO4)2(s)+NaOH(aq) Sb2S3(s)+O2(g)->Sb2O3(s)+SO2(g)
*November 13, 2010 by TMV*

**MATH**

Determine graphically whether each given point is a solution to the system of linear equations. y = 4x-9 y = -2x+3 (2, -1) Is there any good online graph which could help me plot the points and stuff?
*January 5, 2011 by Anonymous*

**chemistry**

Complete the following word equation and write the balanced formula equations: a. Zinc(s) + iodine(g) b. Hydrogen peroxide(l) c. Magnesium(s) + lead(IV) nitrate(aq)
*March 3, 2012 by Anonymous*

**chemistry**

3. Complete the following word equation and write the balanced formula equations: a. Zinc(s) + iodine(g) b. Hydrogen peroxide(l) c. Magnesium(s) + lead(IV) nitrate(aq)
*March 4, 2012 by Anonymous*

**Chemistry**

A compound has four pKa values (3.5, 5.8, 9, and 12). Calculate the pH of the solution when 500 ml of 0.50 M of tetrasodium X is mixed with 650 ml of 1.0 M HCl. Include chemical equations in the answer.
*September 5, 2012 by dhruti*

**Physics**

A stone is thrown from the ground with initial velocity v0 directed at angle alpha with respect to the horizon. Find equations of its motion both in x and y directions.
*November 10, 2012 by David*

**analytic geometry helps are appreciated**

For some positive real number r , the line x+y=r is tangent to the circle x^2+y^2 = r. Find r. How do we do this? Set equal equations together??
*March 1, 2013 by Knights*

**Derivative **

given that f, g, and h are differentiable functions f(g(h(x))) = x what is h'(x) in terms of f, g, f', g', and h'? I plugged in equations on my own like h(x)= x^4 g(x) = 4th root of x f(x)= x^2 i need more assistance on how to proceed thnx
*March 7, 2013 by Mary*

**math**

I am working on quadratic equations and I have worked a problem down to 3 plus or minus the square root of 361 all over 2... what next?
*March 12, 2013 by Robin*

**math**

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 17, 2013 by jack *

**math**

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 20, 2013 by raja harishchandra*

**math**

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 21, 2013 by anonymous*

**Pre-Cal**

How do you find the number of solutions(not all the answers) for each of the following equations 1) 2sec^2 4x - 3sec4x =5 2) 2tan^2 12x +3tan12x -7 =0 3) 2sin^2 5x + 3sin5x +1 =0
*November 18, 2013 by Lilly*

**Calculus 2**

Find Mx, My, and (x, y) for the laminas of uniform density ρ bounded by the graphs of the equations. y=sqrt(x)+4 y=(1/2)x+4 The I keep getting 20/3 for Mx but webassign acts like it is wrong.
*February 5, 2014 by Dominic*

**Math (Calculus)**

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the y-axis. (Use Disc Method) y=3(2-x), y=0, x=0
*May 8, 2014 by Sherman*

**Math**

Which of these equations would not be in quadratic form? A.X^4-13X^2+36=0 B.2X^(2/5)+X^(1/5)-6=0 C.6x^3+2x^2-8X=0 D.3(2/x-4)^2+5(2/x-4)-2=0 I think its between C or D. C because the exponents are different not doubled and D because its set up is completely the opposite from ...
*September 3, 2014 by M*

**Chemisty **

The aqueous solution of two soluble salts are mixed to precipitate an insoluble salt. Give four different equations to support this statement.
*May 3, 2015 by Saurav ; please help*

**English 1**

What did the author of “The Cold Equations” most likely want you to believe? What examples from the story make you think this? Explain your answer in three to five sentences.
*June 17, 2015 by Anonymous*

**Logarithm help please**

Express y as a function of x. What is the domain? Explain your answer. log4y = x + log4 Solving exponential equations with logarithms Solve to the nearest thousandth. 5^1+x = 2^1-x
*September 18, 2015 by Joe*

**Chemistry**

Construct a Born Haber cycle for the formation of calcium oxide showing clearly using equations, the steps of the enthalpy stages involved
*January 28, 2016 by Demario*

**Pre-Calculus**

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. Show your work. 4x - y + 3z = 12 x + 4y + 6z = -32 5x + 3y + 9z = 20 Please help me..
*June 2, 2016 by Liz*

**math**

A group of mathematics teachers went to a restaurant. They agreed to split the bill equally. When the bill arrived, two of them discovered that they had forgotten their money. The others in the group agreed to make up the difference by paying an extra $1.30 each. If the total ...
*April 2, 2008 by Jas*

**Mathematics**

Twelve man take 6 hours to finish a piece of work. After the 12 men have worked for 1 hour, the contractor decides to call in 8 men so that the work can be completed earlier. How many more hours would 20 men take to complete the remaining work?
*May 28, 2012 by Celina*

**Mathematics . **

I need some help with this specific question. In a computer catalog, a computer monitor is listed as being 19 inches. This distance is the diagonal distance across the screen. If the screen measures 10 inches in height, what is the actual width of the screen to the nearest ...
*March 9, 2011 by Celina*

**Mat126: Survery of Mathematics**

In a recent article, the author states that 71% of adults do not use sunscreen. Although 71% is a large percentage, explain why it could be misleading. As you answer the questions above, identify what types of misrepresentation or misuse have been demonstrated by referring to ...
*September 19, 2011 by Leslie*

**algebra**

Solve the inequality. |2x+3|< 26 So there are two answers to this problem? Do you switch the inequality sign for the second answer? This is the absolute value of some quantity I suppose. We have |2x+3|< 26 Thus we want numbers such that -26 < 2x+3 < 26 You can ...
*August 30, 2006 by anonymous*

**Algebra1!Plz help I have test 2morrow!!!**

so would the new eqaution be... 2x+8=10 then.. 2x=2 x=1? We know that y = x + 8. So if x + y = 10, then x + x + 8 = 10. but what about the y?ANd what do I do afetr that? If you know what x equals, then you can calculate what y equals. Once you've solved for x and y, you are ...
*November 4, 2006 by Sammy*

**Help help help!!!!!!!!!**

Simplify 18. -(-4)+3= Solve equations of the form x+a=b solve 26. 6.3=t+2.9 30. -8=14+(d+-6) 32. 312.9+163.4+b 34. - 11/5+w=-4/5 Thank You very much!!!
*December 9, 2007 by Alex*

**PreCalc**

How do I verify that the following equations is an identity: 1+ sec x sin x tan x = sec^2 x
*July 30, 2008 by Glen*

**PreCalculas**

How do I verify that the following equations is an identity: 1+ sec x sin x tan x = sec^2 x
*July 30, 2008 by Glen*

**QUADRATIC EQUATIONS**

How do i solve this, by factorizing... 4x(squared)-196=0 Example: 3x(squared)-12=0 (3x+6)(x-2) THNX
*October 15, 2008 by Sam*

**alegbra**

Need help with this problem 8x-5y=20 5y-8x=-20 Please help me with this problem Solve the system of equations by graphing.
*April 5, 2009 by jspurlock*

**intro. to chemical equations**

Al2(SO4)3 does the 3 apply to everything or just the SO4. thank you.
*May 31, 2009 by Geff*

**math**

Are all linear equations functions? Is there an instance in which a linear equation is not a function?
*June 2, 2009 by scooby9132002*

**Math logs**

Solve the system of equations: y= (lnx)^2 + 2 (lnx^2) y = 3ln(1/x^2)+24 Im not sure what to do..
*October 14, 2009 by Mike*

**Geometry**

Triangle ABC has vertices A = (0,6) B = (-2,3), and C = (2,1). Find the coordinates of its vertices if it is translated by the equations: x' = x - 4, y' = y -3
*December 4, 2009 by Lenora*

**math**

6x-4y=20 and 4y-6x=-20 What is the solution of the system of equations for this problem? A)A point B)No solution C)Infinitely many solutions
*March 27, 2010 by KiKi*

**Vectors **

Given each scalar equation, write a vector equation and the parametric equations. 8x + 9y = -45
*June 5, 2010 by Anonymous*

**math**

Solve the following system of equations x + 4y=6 x= 4-4y A. The solution is an ordered pair ( , ) B. No Solution
*July 9, 2010 by christy*

**math**

how do you find all real and non real solutions to these type of equations?: (x+3)^2 - 81=0 (x+1)(x-2)=18 THANKS!
*August 22, 2010 by Alex*

**calculas**

Find the equations for the tangent line and normal line to the curve for f(x)=(x^4)+(2e^x) at the point (0,2)?
*September 28, 2010 by john*

**math**

I need help on this math problem Solve the systems of equations by elimination. -2x+y=7 6x+12y=24
*February 6, 2011 by pdub*

**science/chemistry**

what does these equations mean metal+water=metal hydroxide+hydrogen
*February 16, 2011 by chloe*

**chemistry**

Write molecular, ionic, and net ionic equations. AgNO3(aq) + KBr(aq) -->
*June 20, 2011 by Brea*

**chemistry**

what is the balanced molecular, total ionic, and net ionic equations for HC2H3O2 + Mg(OH)2 ??
*June 27, 2011 by chelsea*

**Math-System of Equations**

1. Solve for x, y, z in the following system: 2x-3y-2=z y-x+z=1 -y-2z=7 The answers are: x=-7 y=-5 and z=-1 however I don't know how to go about this.
*November 3, 2011 by Lilly*

**Polar equations**

write 3x-6y=-14 in polar form. round phi to the nearest degree
*April 20, 2012 by Please Help Me!*

**math**

Solving Equations with Fractions 1/2 x - 1/3 x = 7/3 solve for X i need help step by step process anyone?
*July 12, 2012 by nain*

**calculus**

Find parametric equations for the line that is perpendicular to the plane 2x-y+3z=7 and intersects the plane when x=1 and y=1.
*January 15, 2013 by Zac*

**calculus**

Find the parametric equations for the line that contains the point (3,1,-4) and is parallel to the line r(t)=(1+2t)i+(-3-t)j+(5+5t)k
*January 15, 2013 by Zac*

**math**

Identify the solution(s) of the system of equations, if any. -2x-4y=1 12y=-6x-3 a) no solution b) (0,-1) c) (-1,0) d) infinitely many solutions
*January 27, 2013 by monet*

**Chemistry**

why is it important that the equations be balanced when performing mass-mass stoichiometry problems?
*March 18, 2013 by Lindt*

**Pre-Calc/Calc**

Which set of parametric equations corresponds to this rectangular equation? y=2x-(x^2 / 10) A. x=4t, y=4t-(t^2 /10) B. x=2t, y=8t-(4t^2/10) C. x=2t, y=4t-(4t^2/10) D. x=.5t, y=2t-(t^2/10) E. x=t, y=t-(t^2/10)
*April 17, 2013 by Chris Math Hw Help*

**Math 116**

identify the solution (s) of the system of equations, if any. -3x-4y=2 8y=-6x-4 a. infinitely many solutions b. (-16/9, 5/6) c.(-2/3,0) d. no solution
*June 21, 2013 by Queta*

**math calculus**

convert these symmetric equations to parametric form: line 1:(x-1)/k = (y-2)/2 = (z+1)/k-1 and line 2: (x+3)/-2 = (z)/1, y=-1
*November 29, 2014 by Sarah*

**Math**

Solve the following systems of equations: -2x+y=1 -4x+y=-1 (3,1) (-1,3) (-1,-3) (1,3) Could someone please help. I'm confused on how to solve this. Thank you!
*December 3, 2015 by Mason*

**Math**

Explain how to solve the following system of equations. What is the solution to the new system? 2x + 2y + z = -5 3x + 4y + 2z = 0 x + 3y + 2c = 1
*January 29, 2016 by RedRov3R*

**Math**

Parametric Equations x = 9s^2 - 1 y = 1 - 8s^3 find dy/dx in terms of s find the coordinates of stationary points
*February 28, 2016 by Tony*

**Algebra**

I am having a problem with solving a composite function in Algebra 1 How do I solve f(x) = -2x + 1 and g(x) = 4x? Don't I need more info? No, that is all you need. I it unclear what you want to do here. see http://library.thinkquest.org/C0110248/algebra/functions_c.htm
*July 18, 2007 by Alec*

**Algebra-Please Help!!!**

You are selling rings for $7 dollars each. You have been contacted by a customer in Alaska who wants to purchase several of these rings and wants you to ship them to her. It’s only going to cost you $5 to ship these items to Alaska. Suppose another company sells the same item ...
*May 17, 2016 by Scarlet*

**Math**

use linear combinations to solve the system of linear equations. 2x+y=4 x-y=2
*February 6, 2008 by Crystal*

**mat**

Is their a free online calculator to graph linear equations? How do you graph x=y+3
*April 21, 2009 by Bryan*

**Algerbra1**

Use elimination to solve each system of equations: s-t=4 over s+t=2; -4x+2y=8 over 4x-3y=-10
*October 21, 2009 by Tyrone*

**maths**

the easiest method for simutanious equations using subsitution method is??
*October 22, 2009 by salman*

**Quadratic Equations**

If I were looking at a graph of a quadratic equation, how do I determine where the solutions are?
*September 2, 2010 by Lynn*

**geometry**

how can you tell in geometry that the equations are parallel, perpendicular , neither, either?
*September 25, 2010 by 14*

**Math**

Use linear combinations to solve the system of linear equations. 5x=4y-30 2x+3y+-12
*January 18, 2011 by Sarah*

**differential equations**

solve the differential equation by seperation of variables 5. y'=xy/2ln y
*March 17, 2011 by cathy*

**math linear equations**

how do u make a linear equation from a data table??
*May 9, 2011 by bob*

**chemistry**

Write molecular, ionic, and net ionic equations. HIO2(aq) + Ba(OH)2(aq) -->
*June 20, 2011 by Brea*

**chemistry**

Write molecular, ionic, and net ionic equations. HIO2(aq) + Ba(OH)2(aq) -->
*June 20, 2011 by Brea*

**Trigonometry**

Solve the equations secΘ - 1 = (√2 - 1)tanΘ
*December 24, 2011 by Kewal*