# 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 482
1. ## Math-Derivatives.

if y=sec^(3)2x, then dy/dx= my answer is 6 sec^3 2xtan 2x but im not sure if that is right. ? Can someone show me if i did it correct.

asked by Anonymous on March 24, 2010
2. ## Maths

Sorry In the rectangle OABC, M is the midpoint of OA and N is the midpoint of AB. OB meets MC at P and NC at Q. Show that OP=PQ=QB

asked by Edwas on March 3, 2018
3. ## Trigonometry

Show that cos M(1/cosM-cosM) is equal to sin^2M

asked by Laly on February 19, 2010
4. ## math

can someone show me how to simplify this complex fraction step by step. (8/X)+11 OVER (1/6x)-1

asked by Anonymous on June 12, 2008
5. ## statistics

It is known from the records of the City Schools that the standard deviation of Algebra scores is 6.0. A sample of 200 students from the system was taken and was found out that the sample mean score is 75. Previous tests showed the population mean to be

asked by pokwang on September 18, 2011
6. ## social studies

which of the following is a example of how art flourished in the region under persian rule? A.large places were built and decorated with sculptures and jewels B. trade was increased greatly in the region C. taxes were collected in this region D. the

asked by it would mean a lot to help on March 5, 2019
7. ## Physics

An Atwood's machine consists of masses m1 and m2, and a pulley of negligible mass and friction. Starting from rest, the speed of the two masses is 3.80 m/s at the end of 3.16 s. At that time, the kinetic energy of the system is 77.0 J and each mass has

asked by devin on February 24, 2011
8. ## Physics

Two astronauts, each having a mass of 61.9 kg, are connected by a 14.7 m rope of negligible mass. They are isolated in space, orbiting their center of mass at speeds of 5.57 m/s. Calculate the magnitude of the initial angular momentum of the system by

asked by Celeste on March 27, 2013
9. ## STE

A polling firm, hired to estimate the likelihood of the passage of an up-coming referendum, obtained the set of survey responses to make its estimate. The encoding system for the data is:   If the referendum were held today, estimate the probability

asked by ALIA on February 15, 2017
10. ## Chemistry

Can someone please explain why reactions go to equilibrium? Does it have something to do with entropy? Are k values random and full of exceptions, or is there some pattern behind it? What makes something thermodynamically favorable in terms on entropy? I

asked by Reagan on April 25, 2019
11. ## social studies

which of the following is a example of how art flourished in the region under persian rule? A.large places were built and decorated with sculptures and jewels B. trade was increased greatly in the region C. taxes were collected in this region D. the

asked by it would mean a lot to help on March 5, 2019
12. ## Physics

A braking system is used to prevent the car travelling faster than 27 m s–1.The car and passengers shown in the diagram have a total mass of 750 kg. The length of track from P to Q is 80 m. Calculate the average braking force that would be required if

asked by tania on February 16, 2011
13. ## Math!

Please Please Please help me! I'm really behind and need to get this done and i'm really confused. 1. 5h – 9 = –16 + 6h (1 point) 4 –7 7 10 2. 4x + 4 = 9x – 36 (1 point) –8 –7 8 –3 3. Which of the following equations has an infinite number of

asked by Marie on December 16, 2013
14. ## chemistry

The percent composition of iron in a sample of steel can be determined by dissolving a sample of steel in concentrated acid. The resulting solution is then titrated with a permanganate solution. When all of the iron has reacted with the permanganate, the

asked by manny on August 19, 2007
15. ## Precalculus check answers help!

1. Which expression is equivalent to cos 2theta for all values of theta ? cos^2 theta – sin^2 theta ~ cos^2 theta – 1 1 – 2 sin^2 theta 2 sin theta cos theta 2. Use a half–angle identity to find the exact value of sin 105°. -1/2(sqrt)(2 + Sqrt3)

asked by Kelsey on May 28, 2012
16. ## economics (4)

Assume that the following data describe the condition of the banking system: Total reserves \$200 billion Transactions deposits \$800 billion Cash held by public \$400 billion Reserve requirement 0.20 By how much could the banks increase their lending

asked by Mia on May 1, 2014
17. ## economics (4)

Assume that the following data describe the condition of the banking system: Total reserves \$200 billion Transactions deposits \$800 billion Cash held by public \$400 billion Reserve requirement 0.20 By how much could the banks increase their lending

asked by Mia on April 30, 2014
18. ## marhs

A wheel is free to rotate about its fixed axle. A spring with constant k = 290 N/m is attached to one of its spokes a distance r = 23 cm from the axle, as shown in the figure. (a) Assuming that the wheel is a hoop of mass m = 490 g and radius R = 0.97 m,

asked by edward on November 15, 2014
19. ## Social Studies

Producers and consumers own the factors of production Custom and habit answer the question of who, what and how to produce Outside trade and commerce is discouraged Roles within the community are defined by custom and gender What type of economic system is

asked by Carol on March 30, 2018
20. ## MEDICAL CODING

Use the CPT manual to assign the appropriate procedure and modifier codes to the following exercise. The Patient had a catheter inserted into the arterial system from the femoral artery and then into the left ventricle for left ventriculography. Report

asked by MEHUL on March 22, 2015
21. ## physics # 9

9. A block attached to a spring of negligible mass undergoes simple harmonic motion on a frictionless horizontal surface. The potential energy of the system is zero at the equilibrium position and has a maximum value of 50 J. When the displacement of the

asked by gomez on August 7, 2007
22. ## AED/222

•Distinguish the greatest strength and the greatest weakness of the current special educational system in America. · Create a mock case study to define exceptionality, describe its classification criteria and characteristics, determine its prevalence,

asked by kim on August 14, 2011
23. ## Chemistry

Calculate the entropy change of the universe (in J/K) when 43.4 g of ethanol vapor is condensed in a laboratory at 20.4 oC. Report your answer in scientific notation to three significant figures. If something is condensed, does that mean the system gaines

asked by Student on January 27, 2008
24. ## Science

A system comprising blocks, a light frictionless pulley, and connecting ropes is shown. The 9 kg block is on a smooth horizontal table The surfaces of the 12 kg block are rough, with μ = 0.30. In Figure 5.7, the mass M is set so that it descends at

asked by Ala'a on November 19, 2016
25. ## Economics (4)

Assume that the following data describe the condition of the banking system: Total reserves \$200 billion Transactions deposits \$800 billion Cash held by public \$400 billion Reserve requirement 0.20 By how much could the banks increase their lending

asked by Mia on May 1, 2014
26. ## Finance

Mooncorp Insurance has quoted you an annual premium to insure your car of \$3100. You are offered a 15% discount if you pay the lump sum immediately. They also offer an alternative payment method. You can pay the account in full by making 12 equal beginning

asked by Raila on December 11, 2015
27. ## algebra

2a+11=a+5 _____ 3 help 2a+11/3=a+5 is that the question? if it is 2a+11/3=a+5/1, then you cross multiply 3(a+5)=2a+11, distribute the 3, which equals 3a+5=2a+11 so now solve for a , bring them to one side, a=-4

asked by debbie on May 18, 2007
28. ## ALGEBRA 1

Determine the equation of combined, then solve for the missing value. Variation x varies directly with y and z. x=5 when y=10 and z=5. find x when y=20 and z=10

asked by Bobby Jones on September 30, 2012
29. ## Statistics

What key problems can a supermarket address and solve utilizing the poisson/exponential combination?

asked by katie on March 8, 2007
30. ## Math

Out of a class of 45 student 2/3 went on a picnic how many students stayed in school solve the multification fraction

asked by Dheeraj on February 3, 2019
31. ## Algebra II

Solve the logarithmic equation. Round to the nearest ten-thousandth if necessary. log 8x^3=4 Can someone walk me through this?

asked by Nickie on December 13, 2017
32. ## math

The polynomials P (x)=x^3-x^2+4x and Q(x)= x^3+6x+10 leave the same remainder when divided by x-a .find the possible values of a and solve the inequality P (x) is greater than Q (x )

asked by tinotenda on August 20, 2016
33. ## Math C30

Last Question disregard .. ooops Solving Equations Containing Circular Functions .. Solve 2cos^2x=1

asked by don on November 2, 2011
34. ## Critical Thinking

Using any of the leadership styles, how would you solve the problem of student parking on campus (to make it more efficient)?

asked by James on June 10, 2008
35. ## Pre-Cal

Solve 5sinx=-4cosx for 0 less than or equal to x

asked by james on January 10, 2010
36. ## algebra

Solve the following equation or inequality for the unknown variable. Round answer to two decimal places if necessary.5n + 2 = 27 n=

asked by kellie on July 2, 2012
37. ## math/algebra

cab someone help me? solve by quadratic formula 3x^2 - 5x = -1 I cannot come up with the -5x and get the 1 for factoring. put it into standard form: 3x^2 -5x +1=0 a= 3 b= -5 c=1 x= (5 +- sqrt (25 -12)/6

asked by dee on August 19, 2007
38. ## math

asked by Michael on April 14, 2013
39. ## algebra

5 children and 2 adults tickets are \$98. adult's ticket is 3 times more than childs solve the equation

asked by mulenga on March 10, 2017
40. ## CHEMISTRY HELP! D;

Balancing Chemical Equations; How would you solve this? 1.Br2(g) + ___H2O(l) + ___SO2(g) ---> ___HBr(aq) + ___H2SO4(aq)

asked by Unknown on August 28, 2013
41. ## College Algebra

1. Find the domain of the composite function f o g. f(x)= 2/x-3; g(x)= 7/x 2. Solve the following exponential equation. Exact answers only. 2^1-9x = e^2x

asked by Kameesha on August 14, 2012
42. ## Algebra, help

So, I've written down 22x+70=17x-95 and I think you would add together 22 and 17, to get 39x right? and then you would subtract 70 from the -95 and get that number and solve, correct?

asked by Allyson on October 18, 2010
43. ## Precalc

How to solve for x: 2^(2x) + 2^(x) -12 = 0 Steps too I tried solving this but I ended with ln(12) / 2ln(2) + ln(2) but the real answer is supposed to be ln(3) / ln(2) or 1.585

asked by Amy on January 27, 2011
44. ## History

What is one environmental issue that both the U.S and Canada are facing. Explain how the countries are working together to solve the problem. PLEASE HELP!!!!!

asked by swimmerGirl on March 2, 2017
45. ## math

Solve X + 1/x – 2 ≥ 3 I know you have to subtract the 3 from both sides to get the zero on right of the inequality sign. I don't understand how to make one fraction after I do this.

asked by Sydney on July 26, 2009
46. ## Algebra

Solve the exponential by expressing each side as a power of the same base and then equating exponents. 5^x-2/4=squaroots 5 please help. Thanks!

asked by Valentina on August 3, 2015

Find the inverse of the function y = (square root x) + 4x , then solve for its 1st order derivative.

asked by Wawen on April 12, 2016
48. ## math

If you have a graph 15 students like b-ball 10 like soccer and 5 like softball Write a ratio and solve the poblem

asked by Jill on November 7, 2010
49. ## Math help

Solve: x^2 +5x=1. Use a calculator to approxiamte the solutions with rational numbers. is the answer -0.1925824, 5.65331193 ?

asked by Shawn on November 9, 2008
50. ## Trigonometry

Solve. 2sin(2ƒÆ) + ã3 = 0 interval [0, 2ƒÎ) How do I start this? I feel like maybe Trig Identities, but I'm not really sure.

asked by Josh on September 16, 2011
51. ## math (surface area)

i know the formula of a rectangles surface area is SA= 2(lw)+(wh)+(lh), but when the dimensions are : 2a for the height, a for the width, and 3a for the length, how do i solve?

asked by aleasha on January 23, 2011
52. ## math

how to solve this equation: 20 8 4 4 = 18 20 + (8/4) - 4 = 18 :) I do not understand the 8/4 part on this answer? Please clarify Count . 8/4 = 2 if you add that to 20 you get 22 and if you then subtract 4 you get 18.

asked by brandi on January 8, 2007
53. ## math

I don't get decimals adding. how do I solve this proble. 2.05+ 3.675. they shouldn't be teaching this in grade 5! :{

asked by sofia on January 13, 2017
54. ## Algebra

Im not even sure what this is called, teacher call's it Multi-Step Equation. What are the steps to solve this problem 5X=X-12 AND X/3+5=14

asked by Denver on October 30, 2007
55. ## Math 12

trig question 2sin^2x+sinx-6=0 how to solve for x when the restriction is x is greater than or equal to zero but less than 2pi

asked by H on October 21, 2010
56. ## AP Calc

Simplify the fraction: (x^3-7x^2+17x-15)/(x-3) and solve numerically to find the two numbers close to 3 between which x must be kept if f(x) is to stay between 1.99 and 2.01.

asked by Naseeb on October 16, 2011
57. ## trig

solve the point given below is on the terminal side of an angle0. find the exact value of the six trigonometric functions of 0. (10,-10)

asked by Anonymous on April 27, 2013
58. ## Math

i have trouble factoring this equation any time x^2 has a number before it i get confused and don't know how to factor how would you solve this -3x^2+5x-2

asked by Anonymous on April 10, 2011
59. ## Math Logarithmic Question

Solve for all possible values of x within the domain of the following logarithmic expressions. a)logx+log2=log7−log3

asked by Chris on January 1, 2016
60. ## math

Solve the equation check for extraneous solutions 6/6-4x/=8x+4 I used/ / for the brackets posssible answers x=1 x=5/2 or x=2 x=5/2 x=5/2 or x=1 Not looking for just the answer, would like to know how to get it.

asked by brandon on August 27, 2012
61. ## math

Write and solve an equation to find the complement of an angle that measures 42 degrees. THX!

asked by Sam on February 27, 2015
62. ## math

Solve the equation Vx + 7 +5=9 a) -3 b) 9 c) 23 d) 16 V= real number root aka 2nd x2 on graphing calc

asked by john on March 17, 2008
63. ## algebra 2

it gives me long dry headaches. Solve the value equation 2/3x - 5/ - 8=8 I know I have to add that -8 to the right side of the equal sign.

asked by bubblegum on September 3, 2015
64. ## math

how do i solve differential equation dy/dx=3/(2-x) and use graphing utility to graph 3 solutions,one which passes through the point(1,0)

asked by mrunal on January 21, 2011
65. ## Algebra

I need to solve these equations : 1) 5w^2 - 5w = 0 2) 2x^2 + 15x = 0 3) -32y^2 - 24y = 0 4) 6h^2 = 3h 5) -42z = 14z 6) -12p^2 = -30p

asked by Scott on March 12, 2013
66. ## Trigonometry

Solve: tan(2theta - 34deg)= sqroot3; theta = [real numbers of degrees]

asked by Ballie on April 19, 2016
67. ## algebra

Solve the equation Vx + 7 +5=9 a) -3 b) 9 c) 23 d) 16 V= real number root aka 2nd x2 on graphing calc

asked by john on March 17, 2008
68. ## College Chemistry

Calculate the number of moles of solute in 5.00 X 10^2 mL of 0.250 M HCl. Can you help me to set this problem up so that I can solve it?

asked by mysterylvr6 on April 6, 2009
69. ## algebra

solve 44= 14-2a i hate these kind of problems they screw wit ur head that's what i think anways i just need help quiz

asked by jennifer garnett on January 14, 2010
70. ## Trig

use a graphing utility to solve each equation, rounded to 2 decimal places 1. x^2 - 2sin2x = 3x 2. x^2 = x + 3cos2x

asked by KC on September 26, 2007
71. ## Math Help

In desperate need of help! solve by factoring. 1. x^2=-25+10x 2. 2x^2+9x=5 3. The length of a square is 4x-3. Find the area in terms of x.

asked by Anonymous on March 20, 2014
72. ## Math

Solve the following two mixed rationals questions: A.) 7689 - 91/103 B.) 5410 + 657/658

asked by Anonymous on September 23, 2015
73. ## Chemistry

I have no idea how to solve this problem could someone explain it to me please What will be the approximate volume when the temperature is 900 kelvin?

asked by Zoella on August 29, 2016
74. ## Physics

asked by John on August 29, 2011
75. ## Algebra

Solve the following equation or inequality for the unknown variable. Round answer to two decimal places if necessary. 10 – x < 4

asked by Terrance.H on July 3, 2012
76. ## Algebra 1

I'm having trouble solving x=2(x-1)+6 I understand but I get confused on some of the problem and this is one of them. It's probably very simple to get the answer but can someone please just walk me through on trying to solve it?

asked by DeJa on September 3, 2013

does consistency mean fair, and can i have a clear explanation on what social proof is, and agitate and solve, and prognosticate,

asked by loli on September 27, 2013
78. ## college algebra

Solve the following exponential equation by expressing each side as a power of the same base and then equating exponents. 31-x = 1/27

asked by yan on August 14, 2015
79. ## Algebra

Find the value of y in each formula if x= -3. y + 1 = 2(x - 5) Substitute -3 for x. The first step leaves you with this: y + 1 = 2 * (-8) = -16 Now solve for y by subtracting 1 from each side of the equation.

asked by Ruby on July 7, 2007
80. ## chem

Given the following wavelength of light, calculate the energy of one photon in Joules. λ = 1 x 10^0 meters what does it mean? i don't know what to do or how to solve

asked by will.i.am on February 11, 2013
81. ## geometry

What type of quadrilateral is formed by connecting the points (0,0), (3x,b), (18x,b), and (15x,0)? Explain. How would I solve this?

asked by Tessa on June 24, 2014
82. ## Chemistry.

In which of these compounds is the oxidation state of CI the highest? a) HCIO2 e) HCIO4 Answer is e Is there a formula to solve this ?

asked by Amy~ on August 29, 2010
83. ## I have the problem halfway solved

-9/7x + 8 < -4x - 5 -9/7x + 4x + 8 , -4x + 4x - 5 -9/7x + 4x +8 < -5 The book then has 19/7x + 8 < - 5 I know how to solve this but I am lacking or trying to remeber how they got 19/7 - need a refresher Convert the "x" terms to common denominators 4 x -

asked by Nik on August 2, 2007
84. ## Algebra

Solve each equation using the quadratic formula. (Enter your answers as a comma-separated list.) x^2 -2x +10=0

asked by Merty on April 17, 2015
85. ## geometry

What type of quadrilateral is formed by connecting the points (0,0), (3x,b), (18x,b), and (15x,0)? Explain. How would I solve this?

asked by Tessa on June 24, 2014
86. ## solving for x

y=e^x how do i solve for x. i use the LN process right. i forgot how to do that ln(e ^ x) = x Leo, you have merely stated an identity. David was solving y = e^x for x, which would be x = ln y Thanks reiny.

asked by david on January 9, 2007
87. ## Geometry

Angles P and Q are congruent. m

asked by queen on July 11, 2017
88. ## Math

complete the equation. -6x^2+15x-6=-(2x-1)(x+__) a. 2 b. -2 c. -3 d. 6 I'm really lost and i dont understand how to solve this problem. any help would be appreciated.

asked by someone on February 24, 2017
89. ## Math

HELP?! 1.-9^2 2.(5x^9y)(-2x^-2y^-3) 3.(a^1b^-2) / (a^-2b^4) 4.(7x^-1/y^4)^-2 Scientific notation: 5) .0000745 Decimal Form: 6) 9.3*10^6 Solve: 7.3√-27 8.√(-5a)^2 Simplify: 9.√60x^5y^2 10.√75x^3 / √3x

asked by Chris on August 16, 2012
90. ## Precalculus

How do i solve this problem? Find the polar form of the complex number where the argument satisfies 0≤θ≤2π. 0+3i

91. ## Math

The equation of the parabola which contains 2 points (1,1) and (-2,-2) and whose tangent at the point (1,1) has the slope k is y=1/3(A)x^2+1/3(B)-2/3(C). Express A,B and C with k .please solve this problem

asked by Bayarbold on June 10, 2011
92. ## Logarithm help

use logarithm to solve A car depreciated at 15% per year. How long is it until it is worth half the original value?

asked by Bobby Funtimes on October 12, 2015
93. ## Physics Field Strength

An electron experiences an electric force of 0.75 nN. What's the field strength at its location? E= N/C How do I solve this problem?

asked by Anonymous on February 3, 2015
94. ## Algebra1

How would i solve this problem?(It's on a MathCounts worksheet and i don't understand it) the ^ mean exponents -(1^2008)+(-1)^2007

asked by Lindsey on October 25, 2007
95. ## trigonometry

rewrite each equation in rectangular form and describe the graph. solve for y if possible. a. theta = pi/6 b. r=8costheta

asked by help on November 25, 2014
96. ## Algebra

Solve the following quadratic equation by completing the square. Simplify the solutions and rationalize denominators, if necessary. x2 + 6x − 17 = 0

asked by diane on April 12, 2016
97. ## Geometry

What is the equation of a line through (-2,5) and whose segment intercepted between the axes in the 2nd quadrant is 7sqrt2? Please help me solve this

asked by Lance on January 7, 2013
98. ## science

What is the speed of an 800-kg car whose KE is 250 kJ? Use the formula KE = (1/2) M V^2 Rearrange it to solve for V. You'll need to take a square root along the way.

asked by tasha on February 19, 2007
99. ## Algebra II Part 2

Use a graphing calculator to solve the equation -3 cos t=1 in the interval from 0 to 2p.Round to the nearest hundredth

asked by Karen on May 19, 2013
100. ## math

I don't want to get this wrong for this homework that i have to turn in can someone please relook at it and tell me if it is correct plz.... solve. x^2+3x-18 my answer is x=3 and x=-6 yes.

asked by jas20 on March 1, 2007