# 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 494
1. ## math/trig

I have two questions as I review for a test tommorow, any help is much appreciated!! Solve: 1) 4sin^2x=2cosx+1 2) cscx+cotx=1

asked by Michael on January 13, 2011
2. ## 7th grade math help Ms.Sue ratios please

Write each ratio in simplest form. 1. 28 seconds / 2 minutes 2. 22 in. / 3 feet 3. 36 cm. / 132 cm. Can you help me i have NO IDEA how to solve these thanks

asked by Delilah on October 25, 2012
3. ## math/trig

I have two questions as I review for a test tommorow, any help is much appreciated!! Solve: 1) 4sin^2x=2cosx+1 2) cscx+cotx=1

asked by Michael on January 13, 2011
4. ## algebra

Help me Solve 1. (2p2 + 7p - 39) ÷(2p-7) 2 (n3 + 7n2 + 14n + 3) ÷ (n +2) 3. (p3-10p2 + 20p + 26) ÷ (p-5) 4. (v3- 2v2 -14v - 5) ÷ (v + 3) 5 ( x3 - 13x2 + 40x + 18) ÷ (x -7)

asked by bheng on September 6, 2014
5. ## Math

the product of two consecutive positive even integers is 14 more than their sum .set up an equation that can be used to find the two numbers and solve it

asked by Maggie on March 1, 2016
6. ## ODE Piecewise

Solve the piecewise linear ODE, y' - y = f(x), y(0) = 1, where f(x) = 1 when 0 \le x \le 1 and f(x) = -1 when x > 1. What is y(2)? Round to the nearest tenth. I stated and got y'-y= ce^x , but wasn't really sure if that was right so I didn't know where to

asked by Erica on September 23, 2016
7. ## Math situation

please help me solve Multiply and simplify type exponential notation with positive exponents (64a^2)/(2a^2-16a+32) x (2a-8)/8a

asked by Sandra M on March 30, 2012

Tiffanny has 100 coins in dimes and nickels. She has a total of \$5.80. How many of each coin does she have. Write the equations then solve.

asked by Rayyan on October 30, 2012
9. ## algebra

Solve each equation. Then write your answers in the cirles so that the differences between any two circles connected by a straight line are the same. a)w+5=7.4 b)e-2=2.5 c)12+r=22.5 d)m+5=15 e)14-y=5.6 f)t-6=4.2 g)13-q=0.9 h)7+c=15.1

asked by rima on November 9, 2009
10. ## Precalculus

Solve 8 sin(2 x) = 6 for the two smallest positive solutions A and B, with A < B Give your answers accurate to at least two decimal places.

asked by anonymous on April 7, 2013
11. ## to bobpursley

I don't understand any of the information you gave me to solve the problem. Ok, write the two equations ( I did one). Now graph them. Where do they cross?

asked by Joeis on December 10, 2006
12. ## Algebra II

Can anyone please teach me how to divide polynomials using long division? It's quite confusing. Like give me a problem to solve and guide me through it.

asked by Me and I on February 7, 2014
13. ## math

Describe a situation this week when you used math to solve a problem involving data, graphs and statistics.

asked by Anonymous on December 29, 2014
14. ## algebra

I having serious problems trying to solve this equation please help me find the product matrix for this input-output and demand matrices A= [ 0.1 0.03] D=  [ 0.07 0.6] 

asked by JC on April 26, 2014
15. ## Algebra

|2 0 4| |3 1 5| |-1 1 -2| I needed the inverse of the matrix above and is the one below correct? If so how do I put the problem down to make it easier to solve. This took me forever. |-7/2 2 -2| |1/2 0 1| |2 -1 1|

asked by mike on December 17, 2009
16. ## Precalculus

Find the complex number z that satisfies (1 + i)z - 2 overline{z} = -11 + 25i. Im not sure how to solve this. I tried distributing the z out first but im still confused on this problem.

asked by Aditya on August 13, 2014
17. ## Please explain

how would you convert the repeating non terminating decimal to a fraction explain the process as you solve the problem 0.1515...

asked by Herc on September 13, 2017
18. ## PRE-CALC

Hi here is my question: Solve: (x-3)/x+3/x2=-6/x^2+2x For my solutions, I got -2 and 0, but the problem is, when I plug the numbers back in, I have zero in the denominator which I know you can't have. I'm not sure what I did wrong, or is it just undefined?

asked by Muffy on October 16, 2009
19. ## Chemistry

What is the volume of 20.55 grams of hydrogen gas at a pressure of 1.215 atmospheres at 29.3 degrees Celcius? how do you solve this

asked by Johnny on March 3, 2015
20. ## Math

Suppose M is between L and N. Use the Segment Addition Postulate to solve for the variable. Then fine the lenghts of LM, MN, and LN. LM=7y+9 MN=3y+4 LN=143 Please tell me how you got your answers.

asked by Jennifer on September 2, 2008
21. ## physics

Over a period of 9.0 seconds a plane changes its velocity from 29.5 m/s to 45.7 m/s. What is its uniform acceleration? ---------------- I'm reviewing for my final and i can not think of what the formula to solve this is.

asked by ash on December 17, 2009
22. ## Math

Exponetial Functions In the following exponential relations, solve for x using logarithms. Round your answers to 4 decimal places. a) 5^3x=65 b) 2^2x+3=80

asked by Chris on January 1, 2016
23. ## physical science

A biker starts to move and goes from a speed of 0 m/s to 25 m/s in a total time of 10s. What is the acceleration? How do I solve this question?

asked by koko on April 16, 2009
24. ## Math

Plz help me to solve In how many years will the money deposited in a bank double itself,if the rate of intrest 12 1/2% per annum?

asked by Simran on January 9, 2013
25. ## MATH,correction

IS THIS CORRECT NOW. solve by using the quadratic formula. x^2 = -5-5 My answer: x = (-5 +- SQRT (5))/(2) I don't see any x term, so b is zero. sorry it suppost to read that first -5x-5

asked by jasmine20 on April 15, 2007
26. ## Geometry

Find the measure of each angle. Sin B=0.7245 Could anyone give me the step to solve these type of problems? Thanks

asked by Shadow on May 12, 2011
27. ## Algebra 2/Trig

Solving Multivariable Linear Systems: 3x-5y+5z = 1 5x-2y+3z = 0 7x-y+z = 5 I am confused on how to solve this. I'm supposed to use the Row-Echelon form. Thanks.

asked by Chris on February 26, 2009
28. ## Math - Functions

For the real valued functions f(x) - |x| - 4 and g(x) = sqrt(5 - x) Find the composition of f o g and the domain in interval notation. Can someone help me solve this?

asked by UnstoppableMuffin on May 2, 2007
29. ## algebra

How you would convert the repeating, nonterminating decimal to a fraction? Explain the process as you solve the problem. 0.1515 . . .

asked by reb on September 25, 2018
30. ## Math

Solve. Movie tickets cost \$9.50. How much change will a customer who pays for one ticket with a \$20.00 bill received?

asked by Emilia on October 11, 2016
31. ## precalculus

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. tan θ = − sqrt 3/3

asked by amaa on November 30, 2012

solve algebriaclly the equation y=2sin2x+1 for 0

asked by MATHS QUESTION!!!!!!!!!!!!!!!!!!!!!!!!!! on December 6, 2009
33. ## ap calc

find the volume generated by revolving the area bounded by y=-x^3, y=0, and x=-2 about the line x=1. I know how to the solve the problem but am not sure how to get the interval. Please help.

asked by anonymous on February 28, 2015
34. ## Algebra II Part 2

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

asked by Karen on May 18, 2013
35. ## math

I am so confused... what is this question asking me to do? Can someone reword this for me or tell me what I am supposed to do to solve it? Determine whether the triple of numbers can be the sides of a right triangle. 9, 12, 16

asked by sam on August 23, 2009
36. ## (Algebra) need help plz

X|-1|0|1|2 Y|-2|1|4|7 What is the rule for the function shown in the tablet? A)y=⅓x+1 B)y=3x+1 C)y=⅓x D)y=½x+1 I think the answer is B...am I wrong?...please help I have no clue on how to solve these kind of problems

asked by GummyBears on May 1, 2015
37. ## MATH

I still don't know how to completely solve systems by substitution. Can someone please help me? 1. Y=-11+x 3x+10y=-6 How would you know where to plug in the right section of the equation in a certain place? 2. Y =6x-5 Y =-x+9

asked by Anonymous on January 28, 2014
38. ## Algebra 2

Solving systems of linear equations in three variables. Ok so i don't really totally get these problems. Can you help me solve this one? and explain everything please? 2x+3y=6+z x-2y=-1-z 3x+y=-1+3z

asked by MaKenzie Smith on November 13, 2010
39. ## geometry

How would i Solve this ?? Secants DB and DE intersect the circle at F and C, respectively Screen shot below remove "()" What is length of DF I forgot the formula

asked by D. on April 27, 2014
40. ## math

Sin theta equals 5/12 in quadrant, find the exact value of cos 2theta. I'm not sure how to solve this question, I need some help.

asked by alyssa on January 16, 2015

I am so confused on how to set this up then solve please help. For a rectangle with area 100 to have the smallest perimeter what divisions should it have? Would I use 2L+2W=P, A=xy, or what. I know it is probably something really simple and I am just not

asked by Jennifer on November 6, 2014
42. ## Math

Solve the inequality. Explain all steps and identify the properties used. n/-3+5>4 Pleasr help I can't figure this out and my grade depends on it

asked by Retarded guy on November 20, 2017
43. ## Math

Calculate the sum of the infinite series 72 + 60 + 50 + 125/3 + ... 489 432 360 307 Can someone please help me with this one? I can never solve these on my own:(

asked by Max on January 12, 2018
44. ## math

just a question i have about solving indirect measurements. when you set up your ratios do you cross multiply and then solve for x by dividing?

asked by reece on January 15, 2015
45. ## algebra

Solve using qaudractic formula.Then use a calculator to approximate to three decimal places, the onlution as rational numbers. X^2-4x+1=0

asked by Lisa on February 15, 2011
46. ## Math

So I have tried MANY ways to solve this i think i have an answer but could someone check? Problem is 48x + 3 = 19 |x=?| find x. Just this one question please!! It will mean a lot to me if you reply. Thanks :)

asked by Student.exe on April 1, 2019
47. ## Data management

1) consider the number of grid paths from the orgin in a coordinate graph to each of the following points: a) (4,7) b) (3,7) c) (4,6) 2) simplify: (n-r)! / (n-r+1)! 3) solve (n+2)!/ (n-1)! = 210

asked by Jane on October 27, 2011
48. ## Integrated Physics and Chemistry

How many calories are absorbed by a copper spoon with a mass of 200 grams as it changes from 28°C to 33°C? A) 0.00027 B) 3 C) 90 D) 13,000 And this one. How do i solve this one?

asked by Destiny on June 21, 2011
49. ## math

Determine the equation of joint variation. Then solve for the missing value. x varies directly with y and z. x = 400 when y = 8 and z = 10. Find x when y = 10 and z = 12.

asked by tyler on June 21, 2011
50. ## math

Solve the following matrices (I don't know how to do brackets so I will just use commas to separate the numbers and put them in different lines) A= 0, -2, 3, 1 -3, 1, 0, 4 0, 5, -2, -1 B= 1, -4 -2, 1 3, 0 C= -1, 0, 2 0, 3, 4 0, 8, -1 E= 1 2 3 4 F= -2, 5 3,

asked by heidi on November 30, 2008
51. ## Calculus

Determine whether the planes are parallel or orthogonal. Equations given: 5x - 3y + z = 4 x + 4y + 7z = 1 How exactly do I solve this? It wasn't covered completely in class.

asked by Krista on April 8, 2013
52. ## 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

asked by Ana on February 28, 2010
53. ## Math

I just started learning about Matrix and I got this as a warm-up problem, but I don't know how to solve it and the examples in my textbook aren't anything like this one: [4x 3y] = [12 -1] Please help.

asked by Charly on December 20, 2018
54. ## chemistry

What is the formula used to solve the problem: How many milliliters of 1.171 M HCl are required to react with 7.69 grams of CaCO3 ?

asked by Paige on March 4, 2010
55. ## Math

What is the easiest way to solve for x. (these are fractions, not dividing) 4/15=x/5 would I find the common denominator or cross multiply and x/3=x+10/6 same question

asked by Anonymous on October 15, 2009
56. ## Math

Solve the function 2(9^x) - 5(3^×) = 12 So what I did So far is changed it into log functions: 2(9^x) = 12 9^x = 6 Log9(6) = x And then 5(3^x) = 12 3^x = 12/5 Log3(12/5) = x So then I don't know how to subtract them because they have different bases :/

asked by Rose on January 10, 2018
57. ## Math

Exponetial Functions In the following exponential relations, solve for x using logarithms. Round your answers to 4 decimal places. a) 5^3x=65 b) 2^2x+3=80

asked by Joseph on December 31, 2015
58. ## Math

If line k*+2y-3=0 passes through point (-5,9) then k= Is that k*x+2y-3=0 ? If so, then substitute -5 for x and 9 for y to get -5*k + 2*9 - 3 =0 and solve for k. Nevermind. I am unable to comprehend this on the computer. I will ask someone to do it on paper

asked by Gina on October 7, 2006
59. ## Exponential Functions?!

solve 9^(2x-3) > 4. Round your answer to the nearest hundredth. The part in parenthesis is up at top like an exponent. I dont' know how to do this. Please help me.

asked by Tabby on April 21, 2012
60. ## geometry

solve 30-60-90 degree trianlge FGH with short leg FG, F(7,5) and G(19), find the coordinates of the four posible points for H

asked by Anonymous on July 1, 2008
61. ## trig

Use the Law of Sines to solve each triangle. P=110 degrees p=125, r=200 in triangel PQR

asked by Tyler on November 26, 2011
62. ## college Trig

Solve this equation on the interval 0 θ < 2π. Round your answer(s) to two decimal places. 2 sin θ + 3 = 2 (smaller value) (larger value)

asked by Anonymous on February 13, 2011
63. ## TRIG

Solve this equation on the interval 0 θ < 2π. Round your answer(s) to two decimal places. 2 sin θ + 3 = 2 (smaller value) (larger value)

asked by Anonymous on February 13, 2011
64. ## PRECALCULAS

Solve this equation. Give a general formula for all the solutions using k to represent your arbitrary integer. sin θ = 1/2 θ =

asked by Jesse on February 13, 2011
65. ## Physics

How many calories are absorbed by a copper spoon with a mass of 200 grams as it changes from 28°C to 33°C? A) 0.00027 B) 3 C) 90 D) 13,000 And this one. How do i solve this one?

asked by Kaitln on February 24, 2011
66. ## Math

Solve. Movie tickets cost \$9.50. How much change will a customer who pays for one ticket with a \$20.00 bill received?

asked by Emilia on October 14, 2016
67. ## math

How do i solve algebraic methods in addition/ subtraction problems such as rewriting the following equations in standard form. 5x + 4 = -9y

asked by Antrinique on December 10, 2012
68. ## Calc

The total area enclosed by the graphs of y=10x^2-x^3+x y=x^2+19x Please Please help me solve this. I have done it amny times, but getting it wrong

asked by John on January 25, 2011
69. ## Math

Find the standard equation of the circle concentric with x^2+y^2-12x-10y = -12 and has a diameter of 10. I have been trying to solve this all day, can you please help me :(

asked by Joshua on June 27, 2016
70. ## Math

How do I solve for the missing letters in the following:? ABCD X 4 ______ DCBA (the 4 is listed under the D and it appears to be done as a mult. problem?

asked by Tyler on December 7, 2007
71. ## college algebra

factor... (x+4)^-3/5+(x+4)^-1/5+(x+4)^1/5 Please explain the process used to solve this type of expression. Answer should be in equation form if that helps....

asked by coried on July 24, 2009
72. ## math

Johns football game last for 50 minutes. What reduced fraction of an hour is that? Can someone please explain to me how to solve this question?

asked by Mindy on November 1, 2011
73. ## Pre- Algebra

4(x-2)=3(1.5+x) Use Dis.Property Combine like terms Solve using inverse operations I just don't understand!Please explain

asked by Anonymous on January 18, 2012
74. ## MATH

1.The point P divides the interval joining A(-1,-2) to B(9,3) internally in the ratio 4:1. Find the coordinates of P. 2. Solve. 4-x/x2

asked by Anonymous on June 29, 2013
75. ## Algebra II/Trig

solve each inequality: 1-2t>-5 and the answer is: t-6 and that's really positive and divide by 2 and that's where the three comes from ... but why does the > symbol change to < ?!

asked by Mary on September 10, 2008
76. ## Differentials (calc)

Solve the Poisson equation ∇^2u = sin(πx) for 0 ≤ x ≤ 1and 0 ≤ y ≤ 1 with boundary conditions u(x, 0) = x for 0 ≤ x ≤ 1/2, u(x, 0) = 1 − x for 1/2 ≤ x ≤ 1 and 0 everywhere else. Hint: break this up as into two different PDEs.

asked by Help please! on December 7, 2015
77. ## Math1

Directions:Solve and graph the inequality using words. Problem: 1.)2x>-4 and x-42x+1 and -4x

asked by margie on April 18, 2007
78. ## Math, science, trinogonomentry

1, solve triangle ABC which have angleA= 250.251 angleB=600.511 and a=3.82 find c

asked by Afatyo on February 10, 2014
79. ## algebra

The hypotenuse of a right triangle is 8m long. One leg is 2m longer then the other. Find the lengths of the legs. How would you solve this equation?

asked by Lexi on April 24, 2016
80. ## Math

Solve the following equation with complex numbers and the quadratic formula : 7x^2-4x+2=0 My answer is 4+- 2i√10 ________ 14 My only question is Can this be reduced ?

asked by Jenna on February 8, 2016
81. ## Math

Solve. Movie tickets cost \$9.50. How much change will a customer who pays for one ticket with a \$20.00 bill received?

asked by Emilia on October 9, 2016
82. ## Math

solve the following inequalities and write the final answer in interval notation.for unions use lower case u eg.(1,3)u(9,10) 1. 5x-12

asked by lovisa on May 6, 2019
83. ## algebra

Determine the equation of combined variation. Then solve for the missing value. x varies directly with y and inversely with z. x = 5 when y = 10 and z = 5. Find x when y = 20 and z = 10.

asked by Anonymous on December 10, 2012
84. ## Math

solve by graphing: x+y=1 2x+y=0 I know that the answer is (-1,2)and i know how to mark the spot but can you explain how to draw the lines because i cant figure out the directions it goes in.

asked by Jaison on October 28, 2009
85. ## Chemistry

A chemist ran the reaction and obtained 5.70 of ethyl butyrate. What was the percent yield? How do I solve this problem?

asked by Nancy on December 6, 2011
86. ## Maths

dx/dt = (x+2) sin^2 2t, given x=0, t=0. Solve the differential equation and calculate value x when t= pie/4, giving your answer in 3 significant figures.

asked by Zee on October 2, 2016
87. ## science

What is the density of Radon (Rn) gas at STP (standard temperature and pressure)? How do I solve/set up this problem? Thank you!

asked by Cassie on January 21, 2014
88. ## math

I need to use calculus to solve this word problem: Find all maximum and minimum values for f(x)= sin(x)+ cos(x) on [0, 2(3.14)] How do I do it?

asked by bob on November 4, 2012
89. ## precalculus

Solve sin(x) = 0.64 on 0 less than or equal to x less than 2pi There are two solutions, A and B, with A < B Give your answers accurate to 3 decimal places

asked by anonymous on April 7, 2013
90. ## statistics

Solve the problem. Suppose a random variable x is best described by a normal distribution with μ = 60 and Find the z-score that corresponds to the value x = 69.

asked by tit on July 17, 2011
91. ## MATH

HOW DO I SOLVE A QUADRATIC EQUATION BY FACTORING? Do you have a specific one? You factor it in this form: (x-a)(x-b)=0 then both factors , x-a, and x-b can be set equal to zero, and then x=a, and x=b.

asked by ANGEL on March 21, 2007
92. ## statistics

The following random sample was collected: 22 33 44 6. The 80% confidence interval for the mean is? I have the answers; however, I do not know how to plug in the numbers to solve the problem.

asked by Nicole on June 21, 2014
93. ## Math, science, trinogonomentry

1, solve triangle ABC which have angleA= 250.251 angleB=600.511 and a=3.82 find c

asked by Afatyo on February 10, 2014
94. ## Algebra

How do I solve a quadratic equation x^2 - x = 30 by completing the square- I don't understand-could someone just explain the steps to solving this

asked by Jamie on September 21, 2010
95. ## Physics

How do I solve this question: What is the resistance of a laptop computer that has an 11V battery & requires 15W of power?

asked by Franchesca on April 19, 2011
96. ## math-rational equations

how do I solve 5/x-3+3/x+3=7x/x^2-9 please explain in detail, I am having trouble once I get to the part where I need to simplify. I have so far the LCD is x^2-9 then the equation changes to (x^2-9) 5/x-3+(x^2-9) 3/x+3=(x^2-9) 7x/x^2-9 or (x+3)*5(x-3)*3=7x

asked by Kay on July 1, 2009
97. ## Math

How you do multiplication as scaling like 2 1/2 x 3 2/3 3 2/3 I suppose to say if it is , or = Can someone explain how to solve this problem I need to learn how to do it because my daughter is having trouble getting it and I don't know how to do it

asked by Lety on February 9, 2017
98. ## trigonometry

solve for equation x(give answer in radians using exact values only. 2sin(x)+cot(x)-csc(x)=0

asked by jojo on October 24, 2015
99. ## Algebra

Hello, I am having a bit of trouble with two Algebra questions 1. Solve x= 8x - over the domain [0, 2, 4, 6] 2. For what values of a is the equation /a/ =5 true? Thanks in advance.

asked by Tamir on December 27, 2009
100. ## chemistry

A salt that could decrease the ionization of HCOl in soln is probably a. NaOH b. NaCl c. NaOCl d. NaH e. none of these how would you solve this

asked by Jin on July 27, 2010