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 513
1. 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

asked by kat on August 13, 2007
2. pre algebre

nee help adding/subtracting fractions, x represents a number, solve by writing answer as integer or simple fraction.

asked by tee on March 2, 2014
3. algebra

save a 100 a month for 30 yrs at 3% interest compounded monthly how much do you have at the end of 30 years what are the steps to solve this problem

asked by sami on September 18, 2010
4. Physics

Yes - if it is the same person answering it - it is me again! My question has STILL not been answered... How would I solve for upwards acceleration with this kind of image, assuming mass and force are given.

asked by Cait on December 6, 2009
5. Physics

A 69 kg skier speeds down a trail, as shown in the figure. The surface is smooth and inclined at an angle of θ = 17° with the horizontal. Help me with an equation to solve. thanks!

asked by Beginner Phys114 on October 26, 2012

how do i solve this problem The Math Behind the LawHow much force is Mike applying to the 1000 kg car to make it accelerate at a rate of .05 m/s2?

asked by shellie on March 5, 2010
7. math

The formula for the area A of the triangle is A=1/2BH, where B is the length of the base, and H is the height. Solve the equation for B. I don't know how I'm supposed to be able to figure this out?

asked by lily on October 16, 2009
8. physics

solve this physics problem for me a vehicle has a mass of 1200kg and four wheels of area 0.06m2 calculate pressure on one wheel

asked by patrick on May 29, 2017
9. Chemistry

If we take 2.2 grams of CO2, 6.02 X 1021 atomes of nitrogen and 0.03 gram atoms of sulphar , then the molar ratio of C, N, and O is . answer is 5:1 :3 how to solve it help please , thanks

asked by Shahab Mirza on October 3, 2014
10. Pre-Cal

solve for r There is a right triangle with the hypotenuse as r , the angle as 45 degrees and opposite side as 20. I am having a hard time finding this out. I had tan 45 = 1.61 20(1.61) = 32.4 but this is wrong.

asked by Hannah on March 23, 2010
11. science

20. Using an example, explain how being able to understand scientific principles and think scientifically can help you solve problems and answer questions in your everyday life. Can you help me Ms. Sue?

asked by anonymous on November 1, 2013
12. Math

I need help on my math the question is make up a set of at least 12 numbers that have the following landmarks with maximum:8 range:6 mode:6 median:5 can you help me solve this equation

asked by Abbey on August 31, 2015
13. math

sam chovell is a private detective working in the Bay area. One month he helped the police to solve five mysteries

asked by mike on November 30, 2011
14. Math

5.Solve the proportion using cross products. (1 point) 18/20 = k/110 a.99 b.122 c.3.3 d.2.9 I'm confused please give me the answer and how you found it so I can do it on my own next time

asked by Ella on November 16, 2017
15. algebra

Solve using the Quadratic Formula (Find all complex-number solutions.) x2 + 4x + 6 = 0 I do not get this at all and this is just practice exercise. Please help as I have a test next week and if I do not get at least a C, I will not graduate. Thank you

asked by slomo on January 30, 2015
16. Algebra

Explain how population and money earning interest can both be represented by the formula A = 1000(1.08)^t. I have no idea how to solve this problem or how to start! Thank you! :-)

asked by Cassie on March 30, 2009
17. math

If it takes 1/4 an hour to type one page, how many pages can be typed in 3 1/2 hours? The answer is 14, right? But what is the written math equation to solve this?

asked by Lorraine on May 1, 2017
18. science

Another question. How do I find out how many molecules of water of hydration are in each formula unit of a compound? I want to solve the actual problem myself, but would like some headway.

asked by Rebekah on September 30, 2007
19. AP Calc

Solve the following absolute value inequalities: |x+1|

asked by Anon on July 12, 2013
20. physics

suppose a car travels at a constant 10m/s how far would it move in 1hr? in 1min? 1ms? could you please explain how i would solve this equation

asked by kerri on September 17, 2009
21. physics

Time() 0 2 4 6 8 10 12 14 16 Velocity() 0 0 2 5 10 15 20 22 22 By measuring the slope of your curve, find the magnitude of the instantaneous acceleration at times = 9s i don't know how to solve it

asked by kim on January 16, 2012
22. Algebra

Given the function f(x)=3x^3+2, find the value of x so that f^-1(x)=4. Thank you. I tried to solve for the inverse by susbsituting y in for x so: x=3y^3+2 and then I subtracted 2 so x-2=3y^3 and I am stuck here, do I just cube root the whole thing? If so,

asked by Trish Goal on November 3, 2014
23. solid mensuration

how to solve ABC is a right triangle with C as the right angle and sides AC=6 cm and BC=8 cm. Line segment CD is drawn perpendicular to both AC and BC at C. If CD=12 cm, find the distance from D to midpoint E of AB.

asked by john roman on April 29, 2014
24. math, beginning algebra

can someone correct this for me: Directions: Solve each literal equation for the indicated cariable. A= 1/2 h (B+b) (for b) Area of trapezoid My answer: 2A divided by h minus B equals b. yes.

asked by jasmine20 on December 20, 2006
25. Algebra

Wrtie an equation of a line passing through (6,10) and (6,-6 y= mx + b Put in the first set of points: 10=6m + b Do the same for the second point. Then, you have two equations, two unknowns. Solve by substitution.

asked by Tony on March 25, 2007
26. math,help

I did the revision for this one i posted before but i don't seem to find my error... Multiply. (x-8)^2 this is what i did to solve. (x-8)(x-8) then I foiled x^2-8x-8x+64 then i combined like terms x^2-16x+64 correct

asked by jas20 on March 2, 2007
27. Chemistry Correction

Hi, I'm trying to solve for the radius of the sphere. This is the correct steps: 8.27*10^-29 = 4/3 pi * r^3 r^3 = 2.0225 * 10^-29 cu meters When I do 8.27x10^-29 / 4/3 pi, I don't get the answer 2.0225x10^-29 Can you tell me what I'm doing wrong?

asked by Nancy on November 30, 2014
28. trig

Solve for ¥è in the equation tan ¥è = 2.42 when 180¨¬ < ¥è < 360¨¬. Round your answer to the nearest tenth of a degree. (Enter only the number.)

asked by Parker on October 5, 2011
29. Math

In the expansion of (1 + x + x^2 + ...+ x^27) (1 + x + x^2 + ... + x^14) ^2 What is the coefficient of x^28? A) 195 B)196 C)224 D)378 Me and my sister are both trying to solve this for school, but keep getting stuck and are confused on it. If you could

asked by SimPug on March 4, 2018
30. Calculus

I am having trouble with this question and I am unsure how to solve it... True or False (with justification) The function sin(x) if x ≤ 0 f(x) = 1+cos(x) if x>0 has a jump discontinuity at x = 0.

asked by Emily on January 29, 2017
31. College Physics

Construct & solve a problem involving a person swimming across a river which has a waterfall some distance downstream. Please help, I have no idea where to start.

asked by Smi on April 12, 2016
32. sra JmcGuin spanish help

Las porcinas are pigs and money made of cocoa will solve world hunger. Not usre i understand about plural

asked by sam on May 5, 2009
33. math

Give an example of a situation in which you might want to solve the savings plan formula to find the​ payments, PMT, required to achieve some goal.

asked by Anonymous on September 12, 2018
34. Math

A wooden duck with a regular selling price of $125.99 is marked down to$79.99. The percent of markdown is: Answer: 36.51% What is the formula? How to solve this?

asked by Liz on January 19, 2012
35. Maths

Solve the given equation: ln(x + 4) + ln(x + 2) = 2 ps - we aren't allowed calculators My ans: I got as far as ln [(x+4)(x+2)] = 2 ln (x^2+6x+8) = 2 And then I am lost, whatever I do ends up with no answer. I also rewrote the above so that it is e^2 =

asked by Neee on August 12, 2010
36. trig

Solve the given triginometric equation analytically. Use values of of x for 0 less than or equal to x less than 2pi sin^2x - 2sinx = 1 How do I get towards the answer of 3.569, 5.856 Thank you again

asked by Priya on May 1, 2008
37. algebra

Is this set a subspace of R3 or not? Explain why or why not. Span{[1 2 1],[-1 1 3]} I've tried to do a three variable three unknown equation to solve for the scalars for each of the vectors but when doing it got very wrong numbers.

asked by Jackk on September 22, 2014
38. geometry

solve for x. file:///Users/macowner/Desktop/Screen%20Shot%202018-02-20%20at%201.02.18%20PM.png

asked by french accent on February 20, 2018
39. trig

Given angle x,where 0

asked by John on April 11, 2014
40. English

How does Holmes solve the mystery in “The Red-headed League”? A. carefully and scientifically B. playfully C. cheerlessly D. eagerly and enthusiastically A?

asked by quick help needed on May 24, 2016

Could someone help with this problem, I have tried numerous of times to solve it. Thank you. Achieve $225,500 at 8.55% compounded continuously for 8 years, 125 days. asked by Denise on February 19, 2015 42. ie math A right triangle has hypotenuse 8 and area 8. Find the perimeter? I think I have to apply Heron's formula to this question, but I don't know how to solve. Please help. Your help is very much appreciated! asked by Dara on March 27, 2012 43. math Use your graphing calculator to find how many seconds before the projectile hits the ground. Let y1 = −16t2 + 800t, or factor and solve for t algebraically asked by alyssa on March 1, 2012 44. Trig Solve, algebraically or with justification (no graphing calculator solutions allowed), the following equation: tan⁡7x-sin⁡6x=cos⁡4x-cot⁡7x asked by Alecs on July 30, 2015 45. Math Solve Mentally with conversion to decimals, no calculation of common denominators. Place the following in ascending order(smallest to largest) 1/4 8/9 7/10 9/21 7/16 2/3 2/47 5/6 3/4 3/5 1/13 1/8 asked by Angela on April 3, 2013 46. Chemistry Sorry, I have a couple more questions. For this question: Which one of the following solutions will be the worst electrical conductor at 25 degrees C? d) 0.10 mol L^(-1) CH3OH (aq) How would I solve this? the answer was d. asked by Amy~ on August 29, 2010 47. Chemistry How many grams of pure uranium can theoretically be extracted from a 10.0 kg sample of pitchblende, which is 92.0% UO2? Im not looking for the answer. I would just like to know the formula to solve the problem. asked by Sean on April 9, 2016 48. algebra Solve \sqrt{10-x} + x=8. Enter your solutions in a comma-separated list. I used the quadratic formula and ended up with-127+-(-215)/2 asked by kim on June 19, 2015 49. Math (repost) How do find the inverse function for this problem: f(x) = -(x+3)^2, x is greater than or equal to 3 I know the first thing you do is switch the variables, so it looks like this: x = -(y+3)^2 Then expand: x = -y^2-6y-9 And solve for y: x + 9 = -y^2-6y I get asked by Monique on August 8, 2009 50. Math permutations pi=(245)(1354)(125) 1) Write as a product of disjoint cycles. Ans: (14)(253) Is this correct? 2) Solve : pi^2, pi^5,pi^(-1) 3) What's the order of pi? and why? asked by Rick on November 24, 2007 51. physics a person whos mass is 102 kg stands on a beam supported by two ropes , A and B, he is standing on one foot to help you solve this problem. asked by vic on October 26, 2009 52. math Use the formula to solve the problems. B * In The amount that results when$3,000 is compounded at 7% annually over eight years. \$ a0 The interest earned in this case.

asked by C on July 4, 2016
53. pre-calc

If the initial investment of 1000 doubles in value in 9.8 years find the rate for continous compounding. so the formula would be A=Pe^rt but where do the numbers go and how do u solve it? Thanks!

54. Science

using an example explain how being able to understand scientific principles and think scientifically can help you solve problems and answer questions in your everyday life? Do you have any suggestions

asked by Science! Help on September 23, 2014
55. Algebra 2

Hey, I have another question. this I just don't understand. I'm really starting to get very confused!!! PLEASE HELP!!!!! Solve each equation by factoring. Check your answers. 3x^2+45=24x

asked by Taylor on November 13, 2014
56. Math : Algebra

I have a whole page of questions I'm trying to complete that are similar to this, but no idea how to do them. If someone could give me a walk through of this question I'd be very appreciative. I'm just suppose to solve the equation. 3n-7/(n-2)(n-3) +

asked by Clark on March 29, 2010
57. PRE-CALC

I am having touble understanding: how to factor the polynomial : 8x^4 -6x^3 -57x^2 -6x-65, into its linear factors, given that i is a zero. I tried to use synthetic division, but i keep getting a remainder... please help me understand how to solve it.

asked by KELLIE on September 26, 2017
58. Algebra

How would you write the following in algebraic expression and how is it solve? Can someone help please? A number is equal to the product of the cubed root of one thousand and seven hundred forty three.

asked by Jesus on August 22, 2007
59. AP Calc BC

Solve the differential equation y'= radical(x)/(-3y) i made y' dy/dx and moved the y's to one side and the x's to the other, and ended up with y^2=(-4/9)x^3/2 + c, but i'm not sure if that's write, and is that the form i'm supposed to leave it in?

asked by Anon on December 15, 2014
60. English

How does Holmes solve the mystery in “The Red-headed League”? A. carefully and scientifically B. playfully C. cheerlessly D. eagerly and enthusiastically A?

asked by quick help needed on May 25, 2016
61. Career

can one define postive mental attitude This is an opinion question, I am assuming. What do you think? If you still need help developing your ideas, just ask. This is as good a definition as any. http://en.wikipedia.org/wiki/Positive_mental_attitude My

asked by Bryan on March 23, 2007
62. biochemistry

I have three questions. I don't even know where to begin. 1. a) If an in vitro fatty acid synthesizing system is supplied with [2-14C]-acetyl CoA as the only source of radioactive label along with all other necessary cofactors/reactants for net fatty acid

asked by an on December 9, 2010
63. Fluid Mechanics HELPPPPP!!!!!

Hi, I have a deadLine untill Thursday to find out the solutions to the following Questions. Can Anyone Help me??? please?? 1) A cylinder with Relative Density=0.5 and height=10m is holding vertical with the bottom base touching the surface of water. If we

asked by Mb on August 29, 2005
64. chemistry

1. An aqueous solution of weak base B of unknown concentration is tritrated with a known concentration of strong acid, HA. (a) Write the balanced chemical equation for this acid-base reaction, identifying the conjugate acid/base pairs. (b) If the

asked by Phuong on April 8, 2011

what role do managers play in helping their organization become successful? How might this impact you as a employer? Managers play a big role in helping their organization become successful. The manager makes sure that everything is going well and that

asked by Anonymous on February 27, 2007
66. Circuits and electronics applications3

In working with complex exponentials we need some simple rules and short cuts for doing the algebra. Remember that a complex number z is a vector in the 2-dimensional plane. It has a length (also called "magnitude") |z| and an angle ∠(z) measured

asked by sengeni on November 25, 2016
67. college

I need help to journalize these transactions for accounting. Samantha purchased inventory costing 125,000 and sold 70% of the goods for 162,500 all purchases and sales were on account She later collected 25% of the accounts receivable Which is the

asked by Ronnie on December 30, 2009
68. Elem. Ed.

I asked this question yeasterday, and was told that I was correct in thinking the most appropriate word to fill in the blank,was the word "expressive." Would someone please make sure that the word "expressive" would be the most appropriate word to use?

asked by Keisha on April 14, 2007
69. high school physics static friction

The system shown below is in equilibrium. Using the fact that block A is placed on a table, has a normal force of 40.2 N and it is not moving, what is the coefficient of static friction on block A? I know you can't answer this but if you have any

asked by Jess on December 8, 2010
70. chemistry

The tail of A vector is fixed to the origen of an X, Y axis system.Originally the vector points along the X axis. As time passes, the vector rotates counterclockwise. Describe how the sizes of the X and Y components of the vector compare to the size of the

asked by anonymous on February 6, 2007
71. History

7.)Which answer best describes the U.S. National Road? A.)It ran from Atlanta to Baltimore and followed the railroad. B.)It ran from New York to Chicago and was made from wooden planks. C.)It ran from Massachusetts to Ohio and ran parallel to the canal

asked by YRN DJ on January 31, 2016

Question: What was your experience with the Center for Writing Excellence (CWE) in the past? In addition to the CWE, what other writing tools are available for revising a research paper? How can you become your own editor and look at your writing with a

asked by rose- Ms. sue on May 27, 2008
73. Physics acceleration

Whats the equation?? I haven't done this is a while. Don't show me the answer i want to figure it out cus that's just how i roll thanks! A car accelerates uniformly from 10 m/s to 20 m/s in 4.2 seconds. What is the magnitude of its acceleration? Do i times

asked by Aisumi on October 30, 2010
74. chemistry

explain what is meant by the term 'Hybridisation' in molecular orbital theory and show how the concept can be used to explain the structure and bonding in ethane C2H6 ETHENE C2H4 AND ETHYNE C2H2

asked by rebecca on December 13, 2011
75. Calculus

Calculate the interval of convergence. Sigma from n=1 to infinity of (n!*x^n)/n^n. Calculus - Steve, Friday, July 29, 2016 at 11:52pm try using the ratio test. You should be able to show that the series converges for |x| < e I tried and I got |x|lim

asked by andre on July 30, 2016
76. Maths

A body of mass m falling from rest is subjected to the force of gravity and an air resistance proportional to the square of the velocity. If it falls through a distance x and posseses a velocity v at that instant then show that.

77. calculus

A quantity has the value P at time t seconds and is decreasing at a rate proportional to sqrt(P). a) By forming and solving a suitable differential equation, show that P= (a - bt)^2 , where a and b are constants. Given that when t= 0, P = 400, b) find the

asked by PPP on November 23, 2011
78. calculus

A quantity has the value P at time t seconds and is decreasing at a rate proportional to sqrt(P). a) By forming and solving a suitable differential equation, show that P= (a - bt)^2 , where a and b are constants. Given that when t= 0, P = 400, b) find the

asked by PPP on November 23, 2011
79. Math

Bart and Bethany play a game. They each roll a regular 6-sided die labeled 1to 6. Use an outcome table to show all possible outcomes: (2 marks) is the total number of outcomes 12?

80. Math

A particle is projected horizontally with velocity V m/s, from a point h meters above ground. Taking g ms^-2 as the acceleration due to gravity, 1. Show the equation of the path is given by y = (2hV^2 - gx^2)/ 2V^2 2. Find the range of the particle. Thanks

asked by Candice on October 20, 2012
81. math

a simple question but i need help for which eqn is the graph of a line w/ undefined slope that passes through (5, 1) a. y=1 b. 5x=y c. x=5y d. x=5 and can you show me how you did the problem. thanks (5,1) is the point on the graph where x = 5 and y = 1.

asked by rach on January 11, 2007
82. Maths sequence and series

1)prove that logx+log(xy)+log(xy^2)+...is an arithmetical progression and show,without using tables that when x=160 2)sum the series 2+6+18+54... To thirty term,by using logarithm,verify that this sumis breather than 2x10^14

asked by Winifred Preston Bob-manuel on December 29, 2016
83. Statistics

Suppose that on average 10% of the people with an airline-ticket doesn't show up at the flight.For a certain flight, the plane has 100 seats and 110 tickets are sold. What is the probability that everyone who shows up will have a seat?

asked by Rechal on March 7, 2017
84. Math

after a cyclist has gone 2/3 of her route, she gets a puncture in a tire. Finishing on foot, she spends twice as long walking as she did riding. How many times as fast does she ride as walk? I know that the answer is 4 but do not know how to get to this

asked by Kelley on December 3, 2017
85. English

In Johnny Tremain tensions were growing between the colonist and the British as the colonists struggled to gain Independence from the British Government. Does this show! external conflict climax or point of view

asked by Steve on October 24, 2013
86. biology

1. explain that not all cell genes show simple patterns of dominant and recessive alleles. 2. explain how to identify th blood types of an offspring. 3. discuss how gender in humans is determined.

asked by diane28 on February 10, 2012
87. Calculus

Compute (f^-1) (2) if f(x) = 7x + 3cos(x) + 2sin(x).... We tried solving it in the form (f^-1)(a) = (1/f'(f^-1(a))... or is this a u-sub problem? We are trying to figure out whose way is right with one getting the answer as 1/2 and the other 1/10... we are

asked by Robin on April 18, 2016
88. chemistry

Show that a conventional x-ray generator is incapable of generating x-rays of wavelength as low as 10-11m. Do this by determining the identity of the target (in atomic number, Z) which would be needed to generate such x-rays.

asked by lena on December 14, 2012
89. Sra JMcGuinn

hi I wanted to thnak you for all of your spanish help. It made a big difference - for the class fashion show dialogue. I have not had spanish homework for a few days. I just asked a history question - I like being prepared for my exams.

asked by sam on November 18, 2007
90. economics

Studies show that the income elasticity of demand for servants in the United States exceeds 1. Nevertheless, the number of servants has been decreasing during the last 75 years while incomes have risen sygnificantly. How can these facts be reconciled?

asked by Brian on August 29, 2009

Methanol (CH3OH) can be made by controlled oxidation of methane. CH4(g) + 1/2 O2(g) ¨ CH3OH(g) I found that the ƒ¢H‹ is -126.4kJ/K and the ƒ¢S‹ is -51.2, and the ƒ¢G‹ at 298 K is 111kJ Yet how do you Calculate the temperature at

asked by janvi on February 25, 2012
92. physics

A particle is moving in a circular trajectory because of a magnetic field. Show that regardless of the veolocity of the particle, it will take the same amount of time to complete one revolution. I'm not sure how to prove this. Should i use the formula for

asked by Jessica on April 1, 2008
93. Biology

Color Blindness is inherited as a sex linked recessive. If a color blind woman marries a man with normal vision, what would you expect in their children? Show a cross I put that X- x- Xx x-

asked by Ash on February 19, 2015
94. college chemistry

Predict two new ionic compounds that may form after you mix these sodium phosphate and calcium nitrate solutions. Write a balanced equation to show which ions would collide and what compound will form.

asked by lesley on October 11, 2016
95. Chemistry

If you had dehydrated 1.00g of the hydrate CaCl2 ∙6H2O how many grams of anhydrous CaCl2 would you expect to be produced? Show calculations. I really am having a hard time with this question. I don't know where to start and how to perform it.

asked by Chris on September 18, 2016
96. math

multiply the equation by a power of 10 to write an equivalent equation with integer coefficients: #1. 4.15x+3.01=10.9x+1.29 #2. 1.596y-3.08=0.9y this is the 2nd time I'm posting this question. but the last reply I got was confusing. can you please show me

asked by Anonymous on September 21, 2009
97. Chemistry

How many drops (1 drop=0.05mL) of 0.20M KI must we add to 100.0 mL of 0.010M Pb(NO3)2 to get a precipitate of lead iodide to start. Ksp of PbI2=7.1e-9. Answer=9 drops. Please show steps.

asked by Cody on March 17, 2013
98. chemistry

Show that a conventional x-ray generator is incapable of generating x-rays of wavelength as low as 10-11m. Do this by determining the identity of the target (in atomic number, Z) which would be needed to generate such x-rays.

asked by kiril on December 14, 2012
99. Chemistry

How many drops (1 drop=0.05mL) of 0.20M KI must we add to 100.0 mL of 0.010M Pb(NO3)2 to get a precipitate of lead iodide to start. Ksp of PbI2=7.1e-9. Answer=9 drops. Please show steps.

asked by Cody on March 17, 2013