# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,718 questions, page 282

In a tracer method the potassium isotope 42K is used for labelling. The half life of 42K is 12.5 hours. If No is original number of atoms, how many hours will it take until only (1/1024) No Atoms remain? The answer is 125 hours but I do not know how to get

asked by Kyle on October 13, 2012
2. ## Management

Below you will find product demand for the past five years for XYZ company. Using two-year average and trend analysis, identify which method is the most appropriate and make a forecast for year six. What would your forecast be? Why? Year Demand ( in 1000s

asked by zeta on January 23, 2007
3. ## Math

Kimberly has a revolving credit account at an annual percentage rate of 15%. Her previous monthly balance is \$784.19. Find the new balance if Kimberly's account showed the following activity. (Use the unpaid balance method)

asked by Desire on August 6, 2019
4. ## Physics

The three displacement vectors in the drawing have magnitudes of A = 5.48 m, B = 5.23 m, and C = 4.75 m. Find the resultant ((a) magnitude and (b) directional angle) of the three vectors by means of the component method. Express the directional angle as an

asked by joe on September 9, 2015
5. ## physics

The three displacement vectors in the drawing have magnitudes of A = 5.73 m, B = 6.48 m, and C = 3.12 m. Find the resultant ((a) magnitude and (b) directional angle) of the three vectors by means of the component method. Express the directional angle as an

asked by anonymous on February 3, 2014
6. ## maths

an amount of Rs 5000 is put into three/investments at the rate of interest of 6%, 7%, 8% per annum respectively; the total annual income is Rs 35800. If the combined income from first two investments is Rs 70 more than the income from the third. Find

asked by edward on July 1, 2013
7. ## math

5/11+root5 How would I rationalize this I think it would be - Multiply both sides by 11-root5 then use the foil method on the denominator to give you 55-5root5/121+5root11-5root11-5 the 2 roots would cancel out giving you 55-5root5/12-5 so would the answer

asked by peter on October 26, 2010
8. ## English

Hi can you please help correct this paragraph or give me direction. Thank you, the assignment is: Your cousin has moved to your town and is looking for a job. Her previous experiences are working as a cashier and sales clerk at two department stores. You

asked by Lin on September 9, 2011
9. ## Physics

Can anyone explain this to me, it was on my exam and i don't get it ; A 14.0 kg crate is pulled up a rough incline with an initial speed of 1.6 m/s. The pulling force is 131.0 N parallel to the incline, which makes an angle of 12.3 ◦ with the horizontal.

asked by Johnnie on March 2, 2011
10. ## american government

1. Which of the following government actions have the greatest impact on promoting racial equality and housing? A. The passage of the title IX amendment to the civil rights act of 1964 B. The passage of the civil rights act of 1968 C. The Supreme Court

asked by v on November 3, 2017
11. ## ap chem

A mole of helium gas contains 6.02x10^23 helium atoms. How many helium atoms are there in a micromole of helium? How many moles of helium does 1.25x10^20 atoms of helium represent? ~I have no idea how to start or what the value of a micromole is?

asked by sara on December 13, 2006
12. ## Physics

A straightforward method of finding the density of an object is to measure its mass and then measure its volume by submerging it in a graduated cylinder. What is the density of a 240-g rock that displaces 89.0 cm3 of water? (Note that the accuracy and

asked by Justin on July 14, 2013
13. ## Physics

A skier speeds down a smooth ski slope which is at an angle of θ = 21° with the horizontal. The mass of the skier is 75 kg. Take the downhill direction to be positive and uphill to be negative. What is the net force acting on the skier? Ok, so I have set

asked by Anna on September 28, 2015
14. ## chemistry

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 252 torr . Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction of

asked by liz on September 24, 2016
15. ## mole fraction

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 241 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction of

asked by Kyle on January 30, 2010
16. ## TWO DIMENSIONAL DESIGN

1. Of the following colors, which one would you use for a room in which people go to relax? A. Red B. Orange C. Purple D. Yellow 2. A sense of unity in a work of art is pleasing because A. all of the elements are the same size. B. it gives the work

asked by tanesha on January 22, 2007
17. ## Chem 1A

A 15.00 g sample of an ionic compound NaA, where A- is the anion of a weak acid, was dissolved in enough water to make 100.0 mL of solution and was then titrated with 0.100 M HCl. After 700.0 mL of HCl was added, the pH was 5.00. The experimenter found

asked by Ashley on March 15, 2012
18. ## Algebra

1. If m∠1=37º , what is m∠4? a) 53º b) 43º c) 37º d) 27º 2. If m∠1=50º , what is m∠5? a) 50º b) 40º c) 35º d) 25º 3. If m∠4=25º , what is m∠8? a) 105º b) 75º c) 175º d) 25º 4. What is the sum of the interior angles of a hexagon?

asked by Maria on April 7, 2015
19. ## Math - intersection of planes

You are given the following two planes: x+4y-3z-12=0 x+6y-2z-22=0 a) Determine if the planes are parallel b) Fine the line of intersection of the two planes. c) Use the two original equations to determine two other equations that have the same solution as

asked by Shaila on September 4, 2010
20. ## algebra

Mat116 appendix F problem #2 2. As you are leaving the community, you notice another new community just down the street. Because you are in the area, you decide to inquire about it. a. The sales representative here tells you they also have two floor plans

asked by Chris on February 16, 2011
21. ## Math

1. Ling has received been approved for a Visa credit card with a \$2000 credit limit, however he has not charged that much since opening the account. On April 24, he discovers a monthly statement from March that had accidentally slid down between his desk

asked by Anonymous on August 25, 2011

1. Ling has received been approved for a Visa credit card with a \$2000 credit limit, however he has not charged that much since opening the account. On April 24, he discovers a monthly statement from March that had accidentally slid down between his desk

asked by kaplan university on April 5, 2011
23. ## Managerial Accounting

Instead of sales of 10,000 pair of skis, revised estimates show sales volume at 12,500 pair. At this new volume, additional equipment, at an annual rental of \$10,000 must be acquired to manufacture the bindings. This incremental cost would be the only

asked by Anonymous on February 24, 2010
24. ## Chemistry HELP

In a constant-pressure calorimeter, 50.0 mL of 0.300 M Ba(OH)2 was added to 50.0 mL of 0.600 M HCl. The reaction caused the temperature of the solution to rise from 21.73 °C to 25.82 °C. If the solution has the same density and specific heat as water,

asked by wisa bedalie on October 18, 2014
25. ## Chemistry

Determine the pH of the following solutions: a) A 250.0 mL solution that contains 0.125 M benzoic acid and 0.147 M sodium benzoate. b) The solution in part (a) after 30.0 mL of 0.510 M hydrochloric acid has been added. a. Ka = 6.3 x 10^-5 pKa = 4.20 pH =

asked by Arthur T on July 15, 2014
26. ## chemistry

At the instant oxygen is reacting at the rate 5.0 x 10-4 mol/L*s, at what rate is NO reacting and NO2 forming? this is a method of initial rate problem. i don't know what to do the chemical equation is 2 NO(g) + O2 (g) ---> 2 NO2 (g)

asked by Chris on September 8, 2007

Using the exact interest method (365 days), find the amount of interest on the following loan Principal Rate (%) Time (days) Exact Interest \$1,700 12½ % 33

asked by Anonymous on June 17, 2013
28. ## physicss

A spring scale being used to measure the weight of an object reads 17.1 N when it is used on earth. The spring stretches 4.40 cm under the load. The same object is weighed on the moon, where gravitational acceleration is 1 /6 g. Find the reading of the

asked by MIKE on January 25, 2013
29. ## PHYSICS *_* HELP PLEASE

A spring scale being used to measure the weight of an object reads 17.1 N when it is used on earth. The spring stretches 4.40 cm under the load. The same object is weighed on the moon, where gravitational acceleration is 1 6 g. Find the reading of the

asked by MIKE on January 25, 2013

A spring scale being used to measure the weight of an object reads 17.1 N when it is used on earth. The spring stretches 4.40 cm under the load. The same object is weighed on the moon, where gravitational acceleration is 1 /6 g. Find the reading of the

asked by MIKE on January 25, 2013
31. ## Algebra

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the remaining solution contains 16% peroxide?

asked by Anonymous on September 15, 2015
32. ## English

Background You’ve applied for a specific job in your field of study. The Human Resources Department arranges an interview and tells you to bring with you a polished piece of writing for them to evaluate your writing skills. The paragraph must describe

asked by Mary on March 7, 2011
33. ## health fraud- hair products

ok so i have to pick a product basically that is like a fraud and it has to be a hair product. then i have to write a summary about it. so i was thinking a product that claims it can grow hair and stop hair lose. Does anyone know of any products like that,

asked by Maryanne on September 4, 2010
34. ## chemistry

1. Calculate pH of an acetate buffer containing 27.5 mM acetic acid (pKa is 4.74) and 50 mM sodium acetate. When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5

asked by Nick on April 12, 2014
35. ## science

Take 1mL of 1M NaCl solution, and add 9mL of water. Then take 10microL of the diluted solution and add 40microL of water. What is the dilution? And what is the final concentration of NaCl? So I see how this is a 2:1 dilution, but I am having a hard time

asked by Alli on November 30, 2016
36. ## Chemistry

Calculate pH of an acetate buffer containing 27.5 mM acetic acid (pKa is 4.74) and 50 mM sodium acetate. When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5 L

asked by Sarah on April 12, 2014
37. ## ALGEBRA

There is 117 grams (g) of acid in 900 g of a solution of acid and water. What percent of the solution is acid? 177/900=R/100 R*900=177*100 R=17,000/900 R=19.667 I WOULD ROUND THAT TO 20% SO R =20% AM I CORRECT IF NOT PLEASE EXPLAIN WHAT I DID WRONG Yes,

asked by TOMMY on March 31, 2007
38. ## Science

Take 1mL of 1M NaCl solution, and add 9mL of water. Then take 10microL of the diluted solution and add 40microL of water. What is the dilution? And what is the final concentration of NaCl? So I see how this is a 2:1 dilution, but I am having a hard time

asked by Alli on November 29, 2016
39. ## Science

I have 2 questions. 1.) Is there a powder that just contains insoluble fiber. I know that Benifiber and many other products contain soluble fiber or both soluble and insoluble fiber. But for the experament I have put together i need an insoluble fiber

asked by Rachel on September 28, 2011
40. ## Phyiscs-Energy conservation

An escalator in a shopping centre carries people up through a height h at a vertical speed of v, but you’re in a hurry when you step onto it, so you climb the moving steps (each with a height of h ) at a rate of n steps/s. Determine: 4.1 the amount of

asked by Debby on April 22, 2014
41. ## physics

"A rod with length L , mass m and resistance R slides without friction down parallel conducting rail of negligible resistance . the rails are connected together at bottom, forming a conducting loop with the rod the plain of the loop makes angle Z wih

asked by ali on July 3, 2009
42. ## Math calculus by rotation

Calculate the volume obtained by rotating around y= -3 the area between the curves x= y^2 -4 x+y+2=0 I did the Volume as an integral between (-4, 0) of (x^2 +x - 12 - 6(x+4) ^1/2) dx The method I used is seeing the solid as a washer(? Can someone help me

asked by Sylvia on December 3, 2018
43. ## HMS 230

What method of ethical oversight (such as a code of ethics, an ethics advisory board, oversight by the board of directors, or an ethics audit) would you suggest for Acre Woods Retirement Community as described in the case study in Appendix D?

asked by Chelle on April 20, 2010
44. ## spell

Illegal immigrants should be allowed into America. An illegal immigrant is any person who enters the United States illegally, or any person who enters legally and stays past the time allowed. There are many arguments that support allowing illegal

asked by Walker on March 4, 2008
45. ## physic

If the work required to speed up a car from 13 km/h to 20 km/h is 6.5×103 J, what would be the work required to increase the car’s speed from 20 km/h to 35 km/h?

asked by paul on February 23, 2011
46. ## english

1)In "The Love Song of J. Alfred Profrock," what mood is created by a setting in which the central character is concerned with the direction of his life? a)cheerful and exhilarating b)introspective and indecisive* c)honey and reassuring d)impersonal and

asked by Jimmy on January 9, 2012
47. ## Math (Trigenometry)

Write f(x)=x^4-12x^3+59x^2-138x+130 as a product of linear factors. I listed the factors of 130 and used synthetic division, but none of the remainders came out to be 0. I graphed the function, but the function doesn't pass through the x-axis. I figured I

asked by Anonymous on February 8, 2011
48. ## Math (Trigenometry) 3

Write f(x)=x^4-12x^3+59x^22-138x+130 as a product of linear factors. I listed the factors of 130 and used synthetic division, but none of the remainders came out to be 0. I graphed the function, but the function doesn't pass through the x-axis. I figured I

asked by 2012 on February 8, 2011
49. ## Math (Trigenometry)

Write f(x)=x^4-12x^3+59x^22-138x+130 as a product of linear factors. I listed the factors of 130 and used synthetic division, but none of the remainders came out to be 0. I graphed the function, but the function doesn't pass through the x-axis. I figured I

asked by Anonymous on February 8, 2011
50. ## algebra

Given that , show that =

asked by syu on April 6, 2015
51. ## Math

show that AB // DC,A=(0,2),B=(4,-1),C=(1,-5),D=(-3,-2)?

asked by Anonymous on June 9, 2011
52. ## Math (Pre cal)

Can someone show me how to do this? let f(x)=x^2+3x-1 and g(x)=x^3+4x^2+1

asked by Misha on August 24, 2017
53. ## algebra

Please show that 1/(g o f)(x) - 1-(g o f)(x)/(g o f)(x) = 1

asked by Thomas on June 2, 2008

3(4 - 2x) - -2x SHow how you did it?

asked by Jeff on December 4, 2014
55. ## Math

asked by Bill on January 11, 2013
56. ## Algebra

(y^3-y^2-4y-7)/(y+1) can someone show me how to do this?

asked by Christopher on April 16, 2014
57. ## Math

If a - 1/a = 2 then show that ( a + 1/a )^2 = 8

asked by Noor on September 12, 2015
58. ## Math

How do I show 52 with l and .

asked by Jennifer on February 7, 2011
59. ## math

Show that f(-x) = -f(x)

asked by juan on July 4, 2011
60. ## Math

What does it mean by: Show that the "value of 3x^2-6x+5" cannot be less than 1. ?

asked by Emily on October 15, 2010
61. ## Math

asked by Bill on January 11, 2013
62. ## arithmetic

can you show me how to do 5/6 x 4

asked by don on January 27, 2011
63. ## maths

If a/b =c/d , a^3c + ac^3 = (a+c)^4 show that ----------- ------- b^3d + bd^3 (b+d)^4 pl help.

asked by kumar on July 28, 2017
64. ## matrices

Given B = 0 1 0 0 0 1 1 0 0 , show that B^3 = I

asked by Neil on May 10, 2015
65. ## Math

If a - 1/a = 2 then show that ( a + 1/a )^2 = 8

asked by Noor on September 13, 2015
66. ## Math

asked by Bill on January 11, 2013
67. ## math

11 - 8 ÷ (1/3 + 1/5) I need to know how to to this please show me. Thank you

asked by logan on June 17, 2012
68. ## algebra1

How much is 40% of \$80? show me how to do this?

asked by peaches williams on June 7, 2011
69. ## math

Show that ( a1/3 - b1/3) ( a2/3 +a1/3 * b1/3 + b2/3 )?

asked by TUHITUHI on September 7, 2012
70. ## math-191

show that k(x)= (5x^3) + (5/x^3) - x- (1/x)

asked by krista on April 13, 2010
71. ## mathematics

If z=xy f(x/y), show that x dz/dx + y dz/dy = 2z

asked by Gerry on June 27, 2014

Show that(a-b)2,(a2+b2), are in a.p

asked by Vijay on October 10, 2016
73. ## Math

Show that y^2-4y-2=0

asked by Larsen on February 19, 2008

Can you please show me how? What is the value of x? x+4= -9

asked by Anonymous :D on October 8, 2014
75. ## maths

If a/b =c/d , show that a^3c + ac^3 = (a+c)^4 ----------- ------- b^3d + bd^3 (b+d)^4 pl help.

asked by kumar on July 28, 2017
76. ## maths

Show that c={x:1?

asked by \$\$ swagzy\$\$ on January 30, 2019
77. ## equations

12^2+2 [(13+3)] / 2^2] -4(3)+5[7-6(-4)^2] -5(3)+3[9-6(-3)^2] please show me how to do these

asked by ME on October 13, 2011
78. ## Calculus

Let u=f(r) and r=|x|=(x1^2 +···|xn^2)^1/2. Show that􏰀 ∑ 1 to n (∂u/∂xj)^2 = (f′(r))^2

asked by Martha on September 27, 2015
79. ## Math

Show that y^2-4y-2=0

asked by Larsen on February 19, 2008
80. ## math

If 2^x=3^y=12^z then show that 1/z = 1/y + 2/x

asked by abc on August 29, 2011
81. ## data management

1) show that a) 2(2n-1 C n-1) = (2n Cn) b) n(2n C n) = (n+1)(2n C n+1)

asked by jane on October 28, 2011
82. ## math

if X:Y =A:B show that Y:B=(X+Y):(A+B)

asked by xyz on March 26, 2017
83. ## Algebra Help

Last one 3(x - 4) = 5(x + 2) Please show how you did it

asked by Jeff on November 18, 2014
84. ## math

If f(x)=2x+1/x-3 and g(x)=1-x/2 Show that f(g)(x)=g(f)(x)

asked by lindsay on December 11, 2012
85. ## algebra

show mw how to do 1.25 of 64

asked by joshua on January 19, 2011
86. ## math

show why 4.25/0.7 is the same as 42.5/7

asked by dell on September 4, 2012
87. ## Math

If a - 1/a = 2 then show that ( a + 1/a )^2 = 8

asked by Noor on September 13, 2015
88. ## MAth

What is another way to show 1/8 + 5/8

asked by Gaby on January 21, 2016
89. ## Calculus

show that e^-x ¡Ö 1-x near x=0

asked by Mike on February 25, 2013
90. ## maths

if x=2^1/3 + 2^2/3 show that x^3-6x =6

asked by tuhituhi on April 9, 2013
91. ## maths

if 3^x = 5^y = 75^z show that z= xy/2x +y

asked by tuhituhi on April 9, 2013
92. ## Math

If f(x)= x+1/x-1 show that x=f(y)

asked by Mandar on December 19, 2017
93. ## maths

if (x + 3)(x -2) = 1 show that x^2 + x -7 = 0

asked by noelle on January 1, 2010
94. ## Calculus need help badllyyy!

Use the expressions for left and right sums and the table below. right-hand sum = summation (n above and i =1 on the bottom) f(ti) * change in t = f(t1) * change in t + f(t2) * change in t + .... + f (tn) * change in t left-hand sum = summation (n above

asked by Zoe on March 13, 2012
95. ## Weighted Averages

I am assuming this is a 1,000g mixture. 42% H3BO3 = 420g H3BO3/(420g H3BO3+580g H2O)= 0.42 by mass. 420g H3BO3/(420g H3BO3+580g H2O+Xg H2O)= 0.06 Solve for X Check my thinking. Check my work. There is an alternative approach. You want to dilute it by a

asked by DrBob222 on October 29, 2006
96. ## mathematics of investment

step by step solving plsss im very law in math so plss to solve step by step thanks.On August 1,1990, Mr.Talamos borrows 9,500 pesos and agrees to pay the compounded amont on the day he pays the debt. If interest is at the rate of 5 1/2% compounded

asked by BM on September 20, 2014
97. ## math, word problem

How do I write the equation for this problem in order to solve it.I can solve it as long as someone shows me how to get the equation. (1)Science. Solve the following application. Jose rode his trail bike for 10miles. Two-thirds of the distance was over a

asked by Jasmine on December 5, 2006
98. ## Science

Could someone please explain to me in a simple way how FM, AM, and XM radio signals work? No one I ask seems to know. Thanks for the help. Radio waves are part of a general class of waves known as electromagnetic waves. In essence, they are electrical and

asked by Jenna on February 18, 2007
99. ## O.D.E

If someone can help me with this ODE I would greatly appreciate it. Thank you in advance! ------ Consider the differential equation dx/dt = 1/2x This is a separable O.D.E., so we know how to find all of its solutions: they are of the form x(t) = sqrt(t+c)

asked by Steve on April 25, 2016
100. ## early childhood

Kindergarten children arrive at school and go directly to their room. They check in and go directly to centers. This method of arrival A. is a waste of the children's and teacher's valuable time. B. uses direct guidance. C. helps the children develop

asked by Diana on May 26, 2019