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

92,096 questions, page 36
1. Help:)

Can someone help me with this? Someone was helping, but I'm still confused! Amos gets in an elevator at the 30th floor and begins to move downward at a speed of 8 feet per second. After 12 seconds, the elevator is 240 feet above the ground. A.) Let y= the

asked by Pebbles on November 19, 2013
2. Physics ~Conservation of Energy~ part 2

1.) A 500 kg roller coaster is pulled to the top of a hill 45 m high and arrives at the top with a zero speed. a) how much work has done by the vhain to pull the car to the top? b) how much potential energy does it have at the top? c)What is the total

asked by Isis on January 30, 2013
3. Math

Solve the system of equations by substitution and explain all your steps in words: 3x + y = 12 x = y − 8 . Is this a good way to explain this problem? Step 1: Since X is given to us. We can plug it into the x-value in the first equation. x= y-8 into

asked by Josh on March 13, 2019
4. prealgebra

An entertainment center is on sale for 20% off original price. The original price is \$225. What is the sale price? How do you solve and show work for this problem above????

asked by vick on February 27, 2012
5. Check My Answers for Science!

1: Which of the following is the minimum level of structure needed to perform the function of waste removal? A: Body System B: Tissue C: Cell*** D: Organ 2: Which two systems work with the muscular system to allow the body to move? A: Digestive and Urinary

asked by Andrew G. on March 1, 2016
6. calculus/finite

I am taking an online finite math class, so I don't have an instuctor to sit down with me and help me. The text book is so hard to follow. One of the problems I have having a hard time with gives an initial tableau and asks us to use the simplex method to

asked by Amanda on December 6, 2009
7. algebra

a chemist mixes an 11% alchohol solution with an 8% alchohol solutoins. How many milliliters of each solution should he use to make a 600ml solution that is 8% alchohol solution? Why wouldn't we just use 600ml of the 8% solution to begin with? So 0ml of

asked by nicole on September 12, 2006
8. Pre Calculus

a biologist has three salt solutions: some 5% solution, some 15% solution, and some 25% solution. She needs to mix some of each to get 50 liters of 20% solution. She wants to use twice as much of the 5% solution as the 15% solution. How much of each

asked by Jaden on June 10, 2015
9. math116

I find from the first equation that x = 3y and plugging in to the second equation we get o.2y+37(-3y)=23 0.2y-111y=23 -110.8y=23 y=-23/110.8 x=69/110.8 need help to understand why the elimination process in not work in this linear equation?

asked by unknown on October 19, 2010
10. Math 209

Predicting Home Prices Selling prices of homes can depend on several factors such as size and age. The accompanying table shows the selling price for three homes. In this table, price P is given in thousands of dollars, age A in years, and home size S in

asked by Lulu on March 17, 2012
11. statistics

. For the table that follows, answer the following questions: x y 1 -1 2 -5 3 -9 4 - Would the correlation between x and y in the table above be positive or negative? - Find the missing value of y in the table. The missing value of y = How would the values

asked by mom on October 4, 2012
12. pre calc

The number N of bacteria in a culture at time t (in hours) grows exponentially according to the function N(t) = 1000e^0.01t When will the number of bacteria reach 1700? I though you would do 1700=1,000^e0.01t and solve for t but i keep getting the wrong

asked by robert on March 11, 2017
13. Math

Paul was given this math problem on a test to simplify: 1/4 + (5/8 + 1/2). after calculating, Paul mistakenly simplified to 9/32 as his final answer In which step did Paul make his first error? Show your work! My work Paul's work 1/4 /9/8 1/4 /(5/8 + 4/8)

asked by Steve B on September 23, 2015
14. algebra

P. 620 #56. Predicting Home Prices Selling prices of homes can depend on several factors such as size and age. The accompanying table shows the selling price for three homes. In this table, price P is given in thousands of dollars, age A in years, and home

asked by genie on November 8, 2011
15. Maths integration

Please help! These 2 questions are very similar, and i tried to do completing square method, but i cant get the correct answer! I'm trying to get the dy/dx to be a complete square thingy to show that the value is always greater or equal to 0. 1. Show that

asked by Aoi on June 19, 2009
16. english

i need help with a thesis statement by a careful study of the work, the author, and of the time period in which the work was written, show how, in terms of genre, style, and vision, the writer holds up a mirror to his or her age.

asked by anonymous on November 11, 2007
17. Human Resources

1. How would you go about developing a performance management system for an organization consisting primarily of professionals (knowledge workers) who work primarily with concepts and ideas, such as analysts and software developers, rather than production

asked by Young on November 14, 2010
18. civics

1)What are the current flaws in the Electoral College system? 2) What changes would you make in the system? 3)Would you make these changes? Why? How? 1)There are several flaws in the Electoral College system. Among these, is the Winner Take All system.

asked by nirvana on March 8, 2009
19. algebra ll

the system of equations y=2x - 3 and y=4 x -3 has: here are the mutiple choices :exactly one solution, no solution, infinitely many solutions , exactly two solutions which one is it and choose the description of the system of equations x plus 2y=7 and 3x -

asked by kara on August 11, 2008
20. 7th Grade Math help ASAP only 2 questions

I have absolutely no idea what these questions are. Can you help? And can you tell me how to solve them? thanks. 6. The bill at a restaurant is \$58.50, and Mrs. Johnson wants to leave a 15% tip. Approximately how much money should she leave? (1 point)

asked by Delilah on November 14, 2012
21. Algebra 2

Use the following equation to perform the operations below (do not graph the equation yet): y ={x + 5}{x + 1}\{(x + 3)(x - 2)}{(x - 4)(x + 1)}) - {1}/{x - 2} What graphical feature occurs at {x} = -1? Use the "trace" function, zoom in on the graph, or look

asked by Boy if you don't on August 6, 2015
22. prealgebra

You are ordering food for home delivery. The cost of your food is \$26. You want to give the delivery person an 18% tip. What is the total cost with the tip? How do you show your work and solve this problem up above?????

asked by vick on February 27, 2012
23. 7th grade math help Ms. Sue please

How do you find the sales tax of something? Here is one of my problems: The price of three dolls are \$12.99. What is the price of the dolls with a 5% sales tax? Show all of your work! I cannot figure out how to put up an equation and solve this problem.

asked by Delilah on November 27, 2012

When we have too much work to do we become very anxious It is vital to set priorities and work on the most important things first. What does the second sentence do? a. It gives an example b. It makes a contrast c. It proposes a solution* d. It states an

asked by Arlynn on March 28, 2011
25. math

Consider these two tables for Line 1 and Line 2. Line 1: x | y 0 1 3 4 Line 2: x | y 0 0 2 4 (a) Graph Line 1 (already did this) (b) Graph Line 2 on the same graph (already did this) (c) What is the solution to the system? Use graphing to solve. Explain

asked by Bella on March 10, 2017
26. Algebra HELP

Can someone check my answers? Solve for m: m + 6 = 3(2m - 4) a.4 b.-6/5 c.18/5 d.2 answer: c. 18/5 Solve the equation and check your solution: 3(x + 6) = 18 + 3x a. -6 b. 0 c. all real numbers d. no solution answer: b. 0 Solve the equation and check your

asked by Cheryl on February 18, 2011
27. Algebra

- ok... we keep getting this one wrong: Solve the following equation for x. Write your answer as a fraction in simplest form. -6(x-5)=-2x-8-6(3x-5) What is it you don't understand about this? Clear the parentheses, combine terms, solve for x. Ive been

asked by Briana on January 21, 2007
28. social studies

the most useful indicator of the degree of democracy reached by a particular society is whther it has a: a)civilan giverment b)formal method wheereby people can effect change in goverment policy c)system of checks and balances

asked by yaz on October 9, 2007
29. Organic Chemistry - Extraction

You have 100 mL of a solution of benzoic acid in water; the amount of benzoic acid in the solution is estimated to be about 0.30 g. The distribution coefficient of benzoic acid in diethyl ether and water is approximately 10. Calculate the amount of acid

asked by Camille on October 3, 2010
30. Math

Which term best describes the solution of the situation represented by the system of inequalities? (Assume that x >= 0 and y >= 0.) 3x + 4y

asked by Sam on November 14, 2014
31. Algebra

Use the five steps for problem solving to answer the following question. Show all work. Andrew is having an irrigation system installed in his yard. Company A charges \$1250 plus \$15 per sprinkler head. Company B charges \$1200 plus \$17 per sprinkler head.

asked by Janet on April 28, 2011
32. Chemistry

In basic solution disproportionate to bromited bromide ions. Use the half reaction method to balance the equation.

asked by Praise on May 18, 2013
33. Chem

Balance the following redox reactions in acidic solution by the half-reaction method Br–(aq) + I–(aq) + HClO(aq) = Br2(l) + IO3 + Cl–(aq)

asked by James on October 7, 2012
34. Algebra

I need help learning to solve substitution. I have a problem that says solve the system by substitution -4.5x-2y=-12.5 3.25x-y=-0.75

asked by Samantha on October 8, 2017
35. Chemistry

a solution of OH- ions is added to a beaker of pure water at 25 C, to a final concentration of 872 nM. Calculate the pH of the solution. I know that pH=-log[H+], but I'm still really confused as to how to convert the nM to M and how to solve this problem.

asked by Kayla on September 5, 2014
36. anthropology

3. Why do kinship systems work? Where, if any, would you find a working kinship system within the United States? Give examples for both questions. most of us are in a kinship system with spouses, children, parents, grandparents, siblings, uncles and aunts.

asked by jimmy on January 30, 2015
37. Algebra

Please Solve: x+sqrt11−x = 5 I do not think there is a solution but here are the choices A. 2 B. 7 C. 2, 7 D. No solution

asked by Rachale on August 2, 2009
38. Algebra

Solve the equation and check the solution: -4(t+7)-(t+6)=10 the solution t is:

asked by Angela on May 16, 2012
39. chemistry

how many grams of CaCl2 need to be dssolved in 100g of water to prepare a solution which freezes at -2.0 degrees? Work this problem just like the previous one EXCEPT there is another part to the formula. Delta T = i*Kf *m i is the number of particles and

asked by jessica on May 31, 2007
40. Math

A two population model is satisfied by a system of differential equations given by, V(x,y) = (ax,by)^T The general solution of the system of differential equations has x = áe^at for some constant á. The parameter t can be eliminated and we can express y

asked by Anonymous on August 25, 2012
41. Math

1) What is the dimension of AB given A is a 5 × 6 matrix and B is a 6 × 3 matrix? for the second questions, it is a fill in a blank question. 2) A point of intersection of the graphs of the equations of a system is a ? of the system. the ? is where one

asked by anonymous on March 31, 2019
42. Math-3 Questions

Hi. Check my answers? Thanks? Also, if I got any wrong, explain to me why because inequalities confuse me sometimes 1. Julia is allowed to watch no more then 5 hours of tv a week. She has already watched 1.5 hours. Write and solve an inequality to show how

asked by Hei Hei on September 20, 2017
43. Math

1. Samuel is 2/3 as old as his brother. In five years, he will be 3/4 as old as his brother will be. Find their present ages. a. If x = the brother’s age now, write an expression for Samuel’s present age in terms of x. b. Write an expression for the

asked by Morgan on November 27, 2012
44. Help!!

1. Samuel is 2/3 as old as his brother. In five years, he will be 3/4 as old as his brother will be. Find their present ages. a. If x = the brother’s age now, write an expression for Samuel’s present age in terms of x. b. Write an expression for the

asked by Morgan on December 17, 2012

1. Samuel is 2/3 as old as his brother. In five years, he will be 3/4 as old as his brother will be. Find their present ages. a. If x = the brother’s age now, write an expression for Samuel’s present age in terms of x. b. Write an expression for the

asked by Morgan on December 13, 2012
46. math analysis

(1/a)+(2/a^2)=0 Solved for zero I'm unsure about the process to solve this, when I do it like my teacher says, it doesn't work. This is for an online advanced math class in which you get three tries to solve the problem. I have already used two. Any help

asked by Hunter on August 23, 2015

Consider the trig equation: 4sinxcos2x + 4cosxsin2x - 1 = 0 in the Interval [0, 2 pi] Either show that there is no solution to the equation in this domain, or determine the smallest possible solution.

asked by Anonymous on November 16, 2009
48. Socail Studies

Between 1805 and 1833, Georgia sold almost 75% of the state to about 100,000 families and individuals for a few pennies. What was this system of land distribution called? A) Headright system B) Yazoo Land system C) Land Lottery system D) Georgia Gold Rush

asked by Lexi-girl on September 8, 2017
49. Computer Science

I posted this question before. The assignment was: write a Java method if the first parameter is less than the second parameter add the two and print the result ten times. How do I write the result 10 times as a loop? This is what I've got but I have a ton

asked by Trish Goal on July 4, 2015
50. Algebra

Ok, I am horrible at math so I am going to need someone's help..... 1. Solve. |x+3|

asked by Ummm... on October 18, 2018
51. Algebra

If i work out my substitution problem and i get 20=20 does that mean i have only one solution or NO SOLUTION?!

asked by Niya on September 14, 2008
52. Statistics

suppose 60 people are asked which method is best to avoid getting the flu. the results are shown in the table below. determine the percentage for each method and complete the table. round to the nearest whole number. Method Frequency % Flu shot 15 washing

asked by Kathryn on August 19, 2014
53. anthropology

Why do kinship systems work? Where, if any, would you find a working kinship system within the United States? Give examples for both questions. This is my answer, am I right? Most of us are in a kinship system with spouses, children, parents, grandparents,

asked by jimmy on January 31, 2015
54. MATH HELPO!!!

Convert the map scale to a unit rate. How many inches represent one mile? Show your work. Interpret the meaning of the unit rate. 3/10 in. = 7/8 mi no map just need someone to solve this unit rate FASTLY

asked by J-kid on February 4, 2017
55. Chemistry

Consider a solution containing 37.0 (+/- 5)% (wt/wt) HCL in water. The density of the solution is 1.18 (+/- 0.01) g/mL. To deliver 0.0500 (+/- 3%)mol of HCL requires 4.18 (+/- x) mL of solution. Find x. My teacher said x= .4. How do you solve for

asked by Andrew on September 16, 2006
56. Chemistry

So this is a three part question. I solved the first part correctly but I need help with the second and third. Q: The dissociation equilibrium constants for the protonated form of of alanine (a diprotic amino acid, H2X+)are Ka1 = 4.6 x 10^-3 and Ka2 = 2.0

asked by Maria on May 9, 2017
57. Algebra

Claudio a banking vice president took 17 neckties to Milto Cleaners. The rate for non silk ties is \$3.25 per tie and for silk ties is \$3.60 per tie. His total bill was \$58.75. How many silk ties did he have dry cleaned? Can you please show work on how to

asked by tara on April 17, 2008
58. operating system

Problem 3- A block of mass m1 = 4 kg moves from rest under the influence of a varying force F(x) = 4x + 38, where F is in newton and x is in meters, on a rough horizontal surface having a coefficient of kinetic friction of 0.2. The block is connected by a

asked by Anonymous on December 3, 2013
59. Physics

Problem 3- A block of mass m1 = 4 kg moves from rest under the influence of a varying force F(x) = 4x + 38, where F is in newton and x is in meters, on a rough horizontal surface having a coefficient of kinetic friction of 0.2. The block is connected by a

asked by Mariam on December 1, 2013
60. Algebra 2

Dante is making a necklace with 18 rows of tiny beads in which the number of beads per row is given by the series 3+10+17+24+... a. If you were to write this series in summation notation, give i. the lower limit of the sum ii. the upper limit of the sum

asked by T on May 6, 2019
61. algebra

solve the system by graphing x+y=4 y=2x+1 I think these are the kind that you take equation #1 and rewrite it as y = -x + 4 and do the table for it plot the dots and connect the line for it. then take equation #2 y= 2x+ 1 do the table and do the same and

asked by dan on August 14, 2007
62. Algebra II

I need some help with some problems as well as need some checked. Could you please help me? Thanks! 1. How do you graph y=1/x 2. How do I the x and y intecepts using a graph? Solve and check the linear equation. 9. (-4x-2)+7=-3(x+3) I got 14 10.

asked by Jessica on August 18, 2007
63. CHEMISTRY

How many grams of NaNO2 should be dissolved in 500cm3 solution of nitrous acid (HNO2) with concentration of 0.03mol/dm3 if we wish the solution to show a pH of 3.2 Ka = 4.5 * 10^-4 M(NaNO2) = 69 g/mol

asked by Anonymous on February 12, 2013
64. math

1.0 Solve for x: (a) 2x ¨C 3(x + 2) ¡Ý 5x ¨C( x- 5) (b) Solve simultaneously x - 5¡Ü 2 and x ¨C 1 ¡Ý 3 2.0 Find solution to: (a) 5/(x-1) > 0 (b) (3x+3)/(3x-x2 ) < 0

asked by lupupa on November 11, 2011
65. Math (Algebra)

Could I have someone check my work please? If I did something wrong please explain to me where I went wrong. Thank You. Example of the product rule to solve would be, (5^3)(6^3) Example of the quotient rule to solve would be, (4^2) / (8^2) Example of the

asked by Lynn on July 18, 2010
66. Algebra

"Using distributive, associative, or commutative property, prove that x^2 - 4 is equivalent to (x - 2)(x + 2)." Firstly, which property would I use to solve this and show equivalence? Secondly, which steps would I need to take in order to show this/obtain

asked by Stacie on January 12, 2015
67. Chemistry

For a π bond, p orbitals should be________ when they overlap. As a result, in the E2 mechanism, an _______ elimination is said to occur. I tried "p orbitals should be parallel when they overlap. As a result, in the E2 mechanism, an antiparallel

asked by Rob on April 11, 2019
68. Geometry

CounterExamples and Inductive Reasoning and Conjectures? Make a Conjecture for Each Scenario. Show your Work - the sum of the first 100 positive even numbers, - the sum of an even and odd number. - the product of two odd numbers. FInd One CounterExample to

asked by Geometry Help!!!! on September 15, 2011
69. Math

I need to solve this with the substitution method. 3x + y = 6 3x + y = 3 Is it possible or is it a typo on the worksheet? I can't figure it out! Try the following very nice site: (Broken Link Removed)

asked by Rachel on June 4, 2007
70. quadratic equations - math

Use any method to solve the following equations, giving your answers to 2 decimal places where necessary. If an equation has no real roots, state this is so. 1. x2-5x+7=0 2. (3x-4)=(4x-3)2

asked by anonymos NEEDS HELP! on August 21, 2008
71. college algebra

6y-7x=12, 7x-6y=-12 solve by graphing method. classify as consistent/inconsistent and dependent/independent. i have been working on this problem and i can't figure it out. please help!

asked by heather on July 9, 2011
72. bussiness maths

using the graphical method solve the following linear programing problem maxmise objective function p=3x+y.subject to following constrains 6x+4y0

asked by judith on November 17, 2010
73. Math

I'm extemely lost at some point, how do you solve this equation by using the inverse of the coefficient matrix and by echelon method -x-8y=12 3x+24y=-36

asked by Anonymous on April 26, 2014
74. Algebra 1

Solve using two different methods. Explain which method you found to be most efficient. A. 3x - 9y = 3 6x - 3y = -24 B. 7x - 3y = 20 5x + 3y = 16 C. y = 1/2x - 6 2x + 6y = 19 I am just stuck and don't know how to do these last few problems on my

asked by Cassie on December 12, 2013
75. Singapore Math

Thanks "drwls" but do you know how to solve that problem using the bar model method? I know what the answer is. I just don't know how to draw it like you do in Singapore math. Thanks...

asked by Ashli on December 12, 2012
76. Simplex Method

Solve the linear programming problem by the simplex method. Maximize P = 27x + 27y + 36z subject to x + y + 3z < 15 4x + 4y + 3z < 65 x > 0, y > 0, z > 0 x + y = z = P =

asked by Leah on April 24, 2011
77. algebra

Essay. Show all work. A school designer wants to create a whiteboard with the optimal dimensions to enhance learning. it is determined that if one side of the whiteboard is x+y inches, the other side should be x^2+6xy-4y^2 inches. Write an algebraic

asked by shay on July 19, 2011
78. algebra

The following stem-and-leaf plot values show the average monthly sales commissions (in hundreds of dollars)for a major co rporation's nationwide sales group: 27,27,29,33,38,44,44,44,46,50,58. What is the mean of the distribution? Please show as much work

asked by Jack on July 20, 2017
79. Math

A student covers the outside of a show box with construction paper. If the student does not cover the lid, what is the surface area that is covered? Please show work. Possible answers: A) 982.25 B) 1433.50 C) 1964.50 D) 5044.50

asked by Victoria on May 5, 2015
80. math

Once you have created both sets of numbers, complete the following tasks. In each task, make sure to clearly label which set you are identifying or describing. Identify the elements of each set that you created. Calculate the mean of each set. Show your

asked by Layla on May 11, 2019
81. Algebra II

In an induction proof of the statement 4+7+10+...+(3n-1)=n(3n+5)/2 the first step is to show that the statement is true for some integers n. Note:3(1)+1=1[3(1)+5]/2 is true. Select the steps required to complete the proof. A)Show that the statement is true

asked by Jon on December 15, 2007
82. algebra 2

how do i work this 3x2-2x-8=0 the solution is -6 and 4 how do you work this out for my class

asked by kay on January 18, 2012
83. Math Estimating Sides of a Triangle

Use the diagram below to answer the question that follows. I couldn't copy the diagram into this. It basically shows a Triangle ACD with CD=100ft. Then another line intersects above angle A and reads BE= 30ft. AB=50ft. and BC=? That is the part it wants

asked by Sheila on December 7, 2016
84. ANT101

The ___ method of anthropology is useful in many different work settings. (Points : 1) marketing pedagogical statistical participant observation

asked by Anonymous on May 2, 2015
85. Universe and Stars

As u look at the stars that re beyond and farther away, what occurs to the angle measured at earth? at what point will this method no longer work? Someone please help explain

asked by Sara on March 4, 2010

bertrand is building in the form of a rectangle. he knows that the garden will be 10 feet wide. he wants to fence in the garden but only has 56 feet of fence to work with. how long mist the garden be to fence it with exactly 56 feet of fence? show how you

asked by dk on December 17, 2010
87. Algebra

Word Problems (Addition/Elimination Method). Check if my answers are correct. 1.A girl bought 2 CDs and 3 DVDs for \$92. Each DVD costs \$4 more than the CDs. What is the price of each CD and DVD? My answer: CDs- \$16 and DVDs-\$20 2.A boy bought 20 stamps,

asked by Amy on September 16, 2012
88. Chemistry

24.5 ml of water are added to a 1.20 molar solution of nitric acid. If the concentration decreases to 0.55 molar, what volume of the concentrated solution was used? 1.20 M x mL = (24.5 mL + mL) x 0.55 M Solve for mL. Check my thinking. When you finish the

asked by Veronica on April 20, 2007

13. Describe the number of solutions for the equation. 10(x-2)=10x A.) one solution B.) no solution C.) infinite solutions*** 14. Describe the number of solutions for the equation. -2(y-3)=2y-6 A.)one solution B.)no solution*** C.)infinite solutions 18.

asked by Aaliyah on February 8, 2016
90. Managerial accounting

What is the method of inventory costing that assumes the unit product costs should be determined separately for each period i the order in which the costs were incurred? I think it is "process cost system". Is that right?

asked by Crystal on February 27, 2011
91. chemistry-Dr BOB

Hi Dr. Bob, I first want to tank you for all your help. Secondly, I don't understand why this was marked wrong. When 27.20mL of .5 M H2SO4 is added to 27.20 of 1M KOH in a coffee cup calorimeter at 23.5 degrees C, the temp rises to 30.17 degrees C.

asked by patrick on October 18, 2015
92. college stats

iN manoa Valley on the island of Oahu Hawaii the annual rainfall averages 43.6 inches with a standard diviation 7.5 inches. for a given year, find the probability that the annual rainfall will be..(solve for a,b,and c) show work a)more than 53 inches

asked by luvmmmath on March 21, 2013
93. chemistry

what mass of ammonium chloride is dissolved in 100 grams water in each of the following solutions in 1.10 molal NH4Cl solution, in a solution which is 75% water by mass in solution with a mole fraction of 0.15 NH4Cl? please help me solve this problem.

asked by andrea on February 27, 2013
94. math

The Eskimos are trying to generate more money because player wages are increasing. they have came up with a couple of plans: Plan 1 : they are going to open up 1850 new seats in the endzone that will be reserved for family seating. they project that they

asked by Anonymous on December 15, 2014
95. chemistry

A volume of 40.0 of aqueous potassium hydroxide was titrated against a standard solution of sulfuric acid h2so4. What was the molarity of the solution if 20.02 of 1.50M h2s04 was needed? Who helps me to solve it for me.

asked by Fai on July 31, 2012
96. pre calculus

solve the equation. give an exact solution, and also an approximate solution to four decimal places. 2^(9x-7)=7 My first step was to change it to log(base 2) 7 = 9x-7 i got 1.0897 Did i do something wrong or did i miss one question?

asked by anonymous on February 5, 2011
97. Algebra

|3x+8|=20; -4 Basically that 4 is asking whether that is a possible solution to the problem. I tried to solve it and the two solutions I got were -28/3 and 4. So I got that -4 is not a solution but if someone could check for me and make sure I didn't mess

asked by Linda on August 27, 2011
98. Math Check

Hi! Can someone check these two answers? Thanks! Directions: Find the correct number of solutions for the following system of equations. 1.) 5x - 3y + 2z = 3 2x + 4y-z = 7 x - 11y + 4z = 3 2.) 2x + y- 3z = 4 4x + 2z = 10 -2x + 3y - 13z = -8 A.) One

asked by Gigi on March 6, 2015
99. trig

solve each equation for è, giving a general formula for all of the solutions: 6. tanè=-1 7. sin(è/2)=1/2 Please show step by step on how to solve these. Im not sure on how to do them. Thank you for your help!

asked by BreAnne on March 7, 2012
100. Science

If a ball is thrown upward on Mars with an initial velocity of 10.0 m/s and lands 1.50 m below its launch point 5.54 seconds after it is thrown , what is the local acceleration due to gravity one Mars .... Plzzzzzzzzz answer it's really important I have to

asked by Katherine on September 10, 2016