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 293
1. mathematics-logarithm

logx^2{base3}=-8 show that x=1/27

asked by p1 on March 19, 2016
2. Calculus

For the curve given by 4x^2 +y^2 = 48 + 2xy show that dy/dx =y-4x/y-x

asked by Kyra on November 20, 2017
3. math

could you please show me the steps to do this problem? 8 2/7-7 1/3

asked by Carolyn on December 9, 2014
4. Algebra

x/5 -x/4 < x-5/5 Show me how to slove the problem.

asked by Sam on May 14, 2008
5. math

Please show the steps and explain how to do this as well. 3√8 · 2√5

asked by Nina on April 10, 2013
6. geometry

show that points A= (10,12,13), B=(13,14,14), and C=(18,18,16) are not collinear

asked by Karen on October 15, 2011
7. phys

asked by Bun on January 28, 2010
8. calculus

let f(x)= 2 - |2x-1|. Show that there is no value of c such that f(3)- f(0) = f'(c)(3-0). Why does this not contradict the mean value theorem.

asked by Sasha on November 7, 2010
9. Calculus

Suppose that 3

asked by bryan on March 4, 2013
10. Maths

if sqrt(y)=arctan(x), show that (1+x^2)dy/dx((1+x^2)dy/dx)=2

asked by NGOFAKA on October 23, 2007
11. Math

Can you show 1 3/5, 1.3, and 1 1/10 on a number line?

asked by Ann on March 11, 2013
12. geometry

A(-3;2),B(2;3),C(1;-2),D(-4;-3) show that ABCD is a rhombus

asked by Anonymous on October 25, 2011
13. Maths

Please show me the way of using formula log?

asked by Maths on October 14, 2011
14. math

find the value of -18 + l-12 l show steps. find the value of -l 23- 14 l show steps.

asked by heaven on January 19, 2012
15. Physics

bobpursley can you show the equasions you are using

asked by Rick on January 8, 2012
16. math

Use the definition of less than to show each of the following a. 2 < 4 b. 3 < 100 c. 0 < 3

asked by Alexandria on October 19, 2009
17. calculus

if y is a function of x and x=e^t/(e^t+1) show that dy/dt=x(1-x)dy/dx help me plz

asked by fui on November 11, 2016
18. Precalc

By appropriate calculations, show that: lim r(x)=5c^4 (x->c)

asked by Grace on January 18, 2012
19. Math

Given that f(x,y)=xy/(x^2+y^2), hence show that fxy=fyx

asked by Beta plus on October 20, 2009
20. math

Does anyone know what function value is and can someone show me an example? Thanks for helping

21. trig

Show that (90-45)=cos90 cos 45

asked by Ntando on April 14, 2011
22. math

why did everybody goto the boat show?

asked by tracy on March 13, 2011
23. Math

3/y+2 over 7/y-4 can u please show me the steps on how you got the answer. Thank You

asked by Scott on May 3, 2010
24. Maths

Let u=7^x. Using the rules for powers show that i) 7^x-1 = u÷7 and ii) 7^2x-1 = u^2÷7

asked by Lauren on October 26, 2016
25. math

in = x out = 2 x so if -1 is in what is out , if 0 in what out, and if 3 in what is out these are three differint promgels and show how you got it

asked by sam on May 6, 2010
26. algebra

expression undefined 1/(2x^2 - 50) Could you please show me how to do this? thank you

asked by peg on March 11, 2011
27. Math

Evaluate can you please show me the steps. -3/4-3/16

asked by Candice on May 5, 2010
28. Algebra

7X-4+3X=23+X Can you show the steps? The answer is X=3

asked by Chelsea on May 24, 2010
29. math

show how to explain answer to p-8p

asked by june on March 21, 2011
30. CALCULUS:)

asked by Brit on August 9, 2011
31. calculus

(2y-1)dy/dx=(3x^2+1) given that x=1 when y=2 plz show step thanks

asked by ... on January 1, 2017

1) 2/3 + 1/8 = 19/24 I do not understand how they got 19/24 can you help me with the steps to show me how. Thank you

asked by Rina on March 14, 2011
33. precalc

f(x)=2+4x-x^2 when x is less than 2 thus f-1(x)=2-sqrt(-x+6) i need to show that f(f-1(x))=x, but i keep getting negative x...any help

asked by ANON on September 30, 2012

Show me a plot diagram example please.

asked by Jordan on October 26, 2009
35. Math

Show that the derivative of y= cosh-1 (2x-1) is: dy/dx = √1/(x2-x)

asked by John on June 29, 2014
36. Math

5/13t=-9 Can someone show me the steps on how to do this please??

asked by Anonymous on September 28, 2017
37. Math

Show sin((a-b)/2) < ((a-b)/2). Why is this true?

asked by Sam on October 11, 2017
38. english

what is the synonym for the word show?

asked by james on November 6, 2007
39. physics

Using units, show that kg x m/s is equivalent to N x s

asked by bryant on November 17, 2008
40. math:/

(7+2)²- 2³= plz show the step to do it

asked by davonte on September 14, 2017
41. math

show that the function f(x) = 5x^4+0.5x^2+8x+24 wherever it is defined

asked by lai on October 3, 2012
42. mathematics-simultaneous eqn

asked by p1 on March 16, 2016
43. algebra

what is 7-4 as subtracting inetgers please show me how you got it

asked by sam on May 11, 2010
44. language

introduction for an essay . show me please

asked by andre on October 2, 2012
45. math

Show that 1/ρ D_ρ/D_t = □(→┬∇ ) . □(→┬V )

asked by Anonymous on April 16, 2011
46. Chemistry

You add 3.5 L of an HCl solution of unknown concentration to 2.0 L of 0.5 M HCl and 4.5 L of water. The final concentration of HCl was 1.5 M. What was the unknown concentration of the initial HCl solution?

asked by Laura on February 12, 2017
47. math

Determind the nature of the solutions of the equation x^2+4=0 Choose the nature of the solutions of the equation. A) 2 imaginary solution b) 1 real solution c) 2 real solutions Thank you for your help.

asked by Kay on August 1, 2009

Can you please clarify your response to my post Wednesday April 4th at 8:53pm and 8:54pm. Thanks for all of your help!!! pleasde repost it. Yes, repost it. Go to it, copy, and paste it here. Thanks. A vertical spring with a spring constant of 450 N/m is

asked by Mary on April 6, 2007
49. Chemistry

Identify the precipitate(s) of the reaction that occurs when a silver nitrate solution is mixed with a sodium chloride solution. Check all that apply. silver nitrate sodium chloride sodium nitrate silver chloride

asked by Betty on October 5, 2016
50. algebra

Beer cans are right circular cylinders. My Algebraic Ale and Logarithmic Lager cans, from the Schmidt Brewery, have dimensional units called "brewskies". They have a volume (in cubic brewskies) equal to the solution of the number of grams of radium 226

asked by Andrea on December 12, 2012
51. science(2 QUESTIONS)

PLEASE ANSWER MY 2 QUESTIONS IN SCIENCE THANKS 3.when a negatively charged object moves in the opposite direction of an electric force field,the potential energy of the object. A.becomes zero(I PICK THIS) B.increases C.decreases D.stays the same 4.the two

asked by Anonymous on February 2, 2014
52. science(2 Qs)

PLEASE ANSWER MY 2 QUESTIONS IN SCIENCE THANKS 3.when a negatively charged object moves in the opposite direction of an electric force field,the potential energy of the object. A.becomes zero(I PICK THIS) B.increases C.decreases D.stays the same 4.the two

asked by Anonymous on February 2, 2014
53. Calc

1. Find values of a,b,c, and d such that g(x) = a(x^3)+b(x^2)+cx+d has a local maximum at (2,4) and a local minimum at (0,0) 2. Need someone to explain this. Graph a function f(x) for which: f(3)=f(5)=0 f'(x)4 f"(x)>0 for all x I know there is concave

asked by Aurora on June 20, 2007
54. drwls,math

so you are saying that i should label p = 30 i = 0.0125/12 = 0.0010416666666666666666666666666667 n = 12(3) = 36 then plug it into what formula ? Problem: Stereo shack sells a stereo system for \$600 down and monthly payments of \$30 for the next 3 yrs. In

asked by student on June 22, 2007
55. algebra

identify the equation of the line through (-1,-4) and parallel to y=-6x+4 i got y=6x+10 Isn't the slope of the original line from y=-6x+4 equal to -6. Your solution has a slope of +6. Are those two lines parallel? i have to identify the equation of a line

asked by eddie on December 14, 2006
56. Calculus

Suppose f(x) is a differentiable function with f(-1)=2 and f(2)=-1. The differentiable function g(x) is defined by the formula g(x)=f(f(x))' A. Compute g(-1) and g(2). Explain why g(x)=0 must have at least one solution A between -1 and 2. B. Compute g'(-1)

asked by Lin on April 1, 2012
57. Chemistry

Benzene (C6H6) and toluene (C5H5CH3) form nearly ideal solutions. At 20°C the vapor pressure of benzene is 74.7 Torr and that of toluene is 22.3 Torr. a) Find the equilibrium partial pressures above a solution of 100.0 g benzene and 100.0 g toluene. b)

asked by Chris on November 14, 2013
58. physics

1. A ball moving horizontally clears a net 2 meters high. What maximum speed can it have if it is to fall within 5 meters of the net? 2.A pulley system lifts a load of 800 Newtons, 20 centimeters while the rope pulling it moves 100 cm. a. How much force

asked by mimi on October 18, 2011
59. PHYSICS

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (a) Draw a diagram for the

asked by Saphina AlMatary on October 30, 2016
60. English

Writeacher, could you please check these examples? Thank you. 1) 'm glad you moved into a new house. I'm pleased you moved house. We were having dinner when the lights went off/out. We didn't 2) What kind of approach can a person have to work? He can work

asked by Matthew on March 16, 2012
61. Physics

The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. (a) Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed of a person situated at

asked by Ryan on September 30, 2016
62. math

The Zalinsky family can drive the 220 miles to their cabin in 4 hours at 55 miles per hour. Son Jeff claims that they could save half an hour if they drove 65 miles per hour, the speed limit. How long will it take the family if they drive 65 miles per

asked by Gabi on April 28, 2011
63. Maths, continuity

Plz help me out with a solution... f(x) = sin(1/x) when x is not = to 0 and f(0) = 0 Thanx in advance... A function is continuous if Limit of y-->x of f(y) equals f(x) for every x. In this case you have t see if this is the case for x = 0. f(0) = 0,

asked by Thirumalai on June 18, 2007
64. chemistry

Lab: Determining the Quantity of Vitamin C in Fruit Juice Vitamin C, also called ascorbic acid, is commonly found in commercial fruit juices and drinks. In this activity you will analyze data collected from a titration analysis of a fruit juice. The

asked by Anonymous on May 24, 2017
65. Chemistry 20

Lab: Determining the Quantity of Vitamin C in Fruit Juice Vitamin C, also called ascorbic acid, is commonly found in commercial fruit juices and drinks. In this activity you will analyze data collected from a titration analysis of a fruit juice. The

66. chemistry

Lab: Determining the Quantity of Vitamin C in Fruit Juice Vitamin C, also called ascorbic acid, is commonly found in commercial fruit juices and drinks. In this activity you will analyze data collected from a titration analysis of a fruit juice. The

asked by Anonymous on May 23, 2017
67. chemistry

Lab: Determining the Quantity of Vitamin C in Fruit Juice Vitamin C, also called ascorbic acid, is commonly found in commercial fruit juices and drinks. In this activity you will analyze data collected from a titration analysis of a fruit juice. The

asked by Anonymous on May 23, 2017
68. chemistry 20

Lab: Determining the Quantity of Vitamin C in Fruit Juice Vitamin C, also called ascorbic acid, is commonly found in commercial fruit juices and drinks. In this activity you will analyze data collected from a titration analysis of a fruit juice. The

asked by Anonymous on May 16, 2017
69. Physics

Block A of mass 4.0 kg is on a horizontal, frictionless tabletop and is placed against a spring of negligible mass and spring constant 650 N m. The other end of the spring is attached to a wall. The block is pushed toward the wall until the spring has been

asked by Joe on September 19, 2010
70. physics

Using a coil made of 117 turns of single-strand copper wire, you use a motor to rotate the coil at a constant angular speed of 30.0 revolutions per second at various orientations and locations throughout the room. In one particularly significant

asked by Tyler on February 3, 2015
71. Geography

Essay Topic: Taken as a whole, what would you say is the single most pressing problem found in Latin America or South America? What possible solutions can you develop? This is what I have: I think the most pressing problem found in South America is

asked by mysterychicken on September 9, 2009
72. math

Calculate the monthly finance charge for the following credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. (Round your answer to the nearest cent.) \$300 balance, 18% rate, \$50

asked by Reggie on December 14, 2012
73. Math Homework

Calculate the monthly finance charge for the following credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. (Round your answer to the nearest cent.) \$3,000 balance, 21% rate,

asked by JONATHAN on November 6, 2011
74. Physics

Vector Addition: I know you can't physically do drawings on this site. Is there a way of someone explaining how to begin with this problem. Can I chose any scale. The directions said to use the head to tail method to determine the resultant vector of the

asked by Dina on February 2, 2016

Calculate the monthly finance charge for the following credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. (Round your answer to the nearest cent.) \$3,000 balance, 21% rate,

asked by JONATHAN on November 6, 2011
76. Chemistry

You are required to plan and design an investigation to test the following hypothesis Black inks from three different brands of permanent makers contains different dyes. I want to know how to go about doing this lab What Aim must be use? What is the

asked by Confused Grace on March 22, 2010
77. physics

A man pulls a 10 kg box across a smooth floor with a force of 53 newtons at an angle of 18 degrees and for a distance of 122 meters. How much work, to the nearest joule, does he do?If the floor is angled upward at 6.7 degrees and the man pulls the box up

asked by blah physics on May 22, 2013
78. Geography (Ms. Sue)

1). What Caribbean island is rich in natural gas, and what impact has this land on the economy? 2). What is the dominant vegetation of the Amazon river basin? 3). What is the main disadvantage of the slash-and-burn method of growing crops? 4). What is the

asked by Anonymous on September 21, 2013
79. Chem 2

A 100-mL sample of water is titrated with EDTA solutions in problem 2. The same amount of Mg2+ is added as previously, and the volume of EDTA required is 31.84mL. What volume of EDTA is used in titrating the Ca2+ in hard water? Previous answers are: Moles

asked by Carlye on February 11, 2014
80. AlgebraB-2

Thanks everybody, I got a solution for figuring out the answer (which is 36) to my first question. But I still need help with the other ones below. Any help would be appreciated: 2. What are the solutions of the equation x2 + 4x = 96? (1 point) 2, –48

asked by Jennifer W. on March 21, 2013
81. Math

Jane will receive 18% less of her regular pay when she retires. Her regular pay is \$500 per week. a How much would she receive per week if she retires today? answer: 500/18% = 90 500-90= \$410 b. Explain how you can make this same calculation using

asked by John on March 26, 2015
82. Chemistry

I have 2 chemicals, A & B. Note: both do not contain buffer salts. Chemical A expires 1 week later. Chemical B expires next year. I prepare solution C (general laboratory reagent)containing Chemicals A & B. When assigning the expiry date of solution C,

asked by anne on July 23, 2011
83. Chemistry

When 2.25 g of sodium hydroxide (NaOH) was dissolved in 150.00 g of water a value of 11.00oC was obtained for ΔT. 1. Calculate the molarity of the sodium hydroxide solution. 2. Calculate the value (calories) for the heat of solution of 2.25 g of NaOH. 3.

asked by Kales on October 20, 2014
84. Chemistry

The concentration of barium ions in any solution can also be determined via gravimetric analysis. An impure sample of barium nitrate with a mass of 1.234 g, is completely dissolved in water and the resulting solution is reacted with an excess of aqueous

asked by sarah on January 13, 2016
85. Chemistry

The concentration of barium ions in any solution can also be determined via gravimetric analysis. An impure sample of barium nitrate with a mass of 1.234 g, is completely dissolved in water and the resulting solution is reacted with an excess of aqueous

asked by sarah on January 13, 2016
86. Math

A student is in a 20 week calc class. The function f(t)=50-50e^0.2t f(t) measures the students problem speed in t weeks -how many problems per hour can a student solve at the beginning of the course - how many problems per hour can a student solve halfway

asked by Marshall on July 20, 2012
87. Calc

A student is in a 20 week calc class. The function f(t)=50-50e^0.2t f(t) measures the students problem speed in t weeks -how many problems per hour can a student solve at the beginning of the course - how many problems per hour can a student solve halfway

asked by Marshall on July 20, 2012
88. probability

This figure below describes the joint PDF of the random variables X and Y. These random variables take values over the unit disk. Over the upper half of the disk (i.e., when y>0), the value of the joint PDF is 3a, and over the lower half of the disk (i.e.,

asked by anonymous on December 8, 2017
89. philosophy

I am to present an account of at least one metaphysical account of reality from the assigned readings. I am to discuss Plato, Aristole or the Cartesian method. Make sure that you include an account of reality and truth and discuss(and/or whether)human

asked by angela on April 10, 2013
90. Education technology

including the elements of design in visual art? The elements work together to help influence thoughts and emotions The elements are mandatory in any piece of art work Art is not art without each element The elements are individual and only element should

asked by Tula venegas on May 9, 2016
91. chemistry

A benzene solution of a nonvolatile solute exhibits a vapor pressure of 90.5 torr at 25 degree C. The vapor pressure of benzene at 25 degree C is 93.9 torr.. what is the mole fraction of the solute in this solution?

asked by Amanda on September 26, 2010
92. Chemistry

5.00 mL of 2.00x10^-3M Fe(NO3)3 is mixed with 4.03 mL of 2.00x10^-3M NaSCN and 1.08 mL of 0.1M HNO3, for a total volume of 10.11 mL. a) What is the initial concentration of the Fe(NO3)3 in the mixed solution? b) What is the initial concentration of the

asked by Dan on February 26, 2014
93. math (interests & percentss)

i need help with these problems below ! mike deposited \$500 for 9 months at 8%, compounded quarterly. a. how many times was interest added to mike's account? b. what percent interest was added each time? c. what was the balance in mike's account at the end

asked by bree on November 18, 2010
94. Math Word Problems

Hi, I am having some trouble with some problems, can you please help. thanxs!!! 1. A car rental agency charges \$250 per week plus \$0.25 per mile to rent a car. How many miles can you travel in one week for \$300? -Would the equation look like: 300= 250x +

asked by Vanessa on August 18, 2007
95. Social studies

Which conclusion is best supported by this map? A. The Aztec empire conquered the Olmec civilization. B. The Olmec civilization depended on slash-and-burn agriculture. C. The Aztec empire expanded across a variety of landforms. D. Food production was

asked by cash on February 27, 2019
96. Research Practicum

I'm conducting a research project on "to what extent are college students addicted to text-based college communication?" this is my survey I created. Is this a good survey? and how do I evaluate my responses from, let's say, 50 surveys to table data to

asked by Miguel on February 24, 2011
97. math

Jenny places 100 pennies on a table, with 30 showing heads and 70 showing tails. She chooses 40 distinct pennies uniformly at random and turns them over. That is, if a chosen penny was showing heads, she turns it to show tails; if a chosen penny was

asked by anonymous on June 18, 2013
98. smoking!

4. Cigarette smoke has been found to have the following effects on the respiratory system. 1. There is destruction of many of the cilia that line parts of the respiratory tract. 2. There is a thickening of the walls of the bronchioles, thus reducing the

asked by katrina! on August 12, 2006
99. chemistry

what are the hydronium-ion and the hydroxide ion concentration of a solution at 25 C that is 0.0050 M strontium hydroxide, Sr(OH)2? a solution of hydrochloric acid is 0.20 M HCl. What is the hydronium-ion at 25 C? What is the hydroxide ion concentration at

asked by Henry on August 6, 2011
100. Biology

How is it a solution of 300mOsM NaCl is both isotonic and isosmotic to a red blood cell with an osmolarity of 300mOsM? Yet a solution of 300mOsM urea is only isosmotic to that red blood cell?

asked by p on October 14, 2011