Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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 Algebra: Expressions involving variables, substitution Solvers Lessons Answers archive Quiz In Depth

 Question 440633: _v+9_=8 the v+9 is divided by 3 3 Click here to see answer by robertb(4012)

 Question 441336: (w^3)^4 expand the expression above using the definition of an exponent Click here to see answer by stanbon(57940)

 Question 441811: Simplify each expression. Show canelling and factoring x^2+4x-12/x^2+7x+6*10/x-2 Thanx for the help! Click here to see answer by stanbon(57940)

 Question 441982: A manufactor determines that the profit in dollars for manufactoring n units is P=2n^2-10n-175 (Assume that n is a positive integer). How many units are produced when the profit is \$425? Click here to see answer by stanbon(57940)

 Question 442206: when x = 6 and y = 14, what is the value of y when x = 9? solve the proportion using the product of the means = the product of the extremes. Click here to see answer by jorel1380(2518)

 Question 442915: This is a substitution/elimination problem. A coffee counter charges 9.00 per pound for Kenyan French Roast coffee and 8.00 per pound for Sumatran coffee. How much of each type should be used to make a 20 pound blend that sells for 8.40 a pound? Click here to see answer by nerdybill(7003)

 Question 443039: Six grapefruit cost as much as ten oranges. The cost of a dozen grapefruit and two dozen oranges is \$33. How many cents does one orange cost? Click here to see answer by swincher4391(726)

 Question 443190: 25x^4-25x^2+6=0 i worked the problem out and got x=square root of 3/5 and 2/5 am i doing this right Click here to see answer by swincher4391(726)

 Question 442015: HOW DO YOU SOLVE X+Y=56 AND X+3Y=56 using substitution Click here to see answer by rwm(914)

 Question 442818: 3. You recently started the paperwork to purchase your new home, and were just notified that you can move into the house in 2 weeks. You decide to hire a moving company, but are unsure which company to choose. You search online and are interested in contacting two companies, Heavy Lifting and Quick Move, to discuss their rates. Heavy Lifting charges an \$80 fee plus \$35 per hour. Quick Move charges \$55 per hour with no additional fees. Click here to see answer by rwm(914)

 Question 443495: square root of 32a^2b simplify i got 4a square root of 2b Click here to see answer by MathLover1(6801)

 Question 443125: Hello! Help on the following please: The frame for a shipping crate is to be constructed from 22 feet of 2x2 lumber. a) If the crate is to have square ends of side x feet, express the outer volume Vof the crate as a function of x (disregard the thicknessof the lumber). b) Sketch the graph of V for x>0 Thanks Mak Click here to see answer by ankor@dixie-net.com(15745)

 Question 443584: 112s^2 + 392st + 343 t^2 i need to factor dont know were to start Click here to see answer by swincher4391(726)

 Question 443611: solve by the substitution method and find the solution as an ordered pair Click here to see answer by rfer(12726)

 Question 443655: how do you solve ? You mean simplify? Click here to see answer by chriswen(106)

 Question 443714: Which value of x is the solution of 2x/5 + 1/3 = 7x-2/15 ? Click here to see answer by MathLover1(6801)

 Question 443956: The state of Colorado is almost perfectly rectangular, with its north border 111 miles longer than its west border. If the state encompasses 104,000 square miles, estimate the dimensions of Colorado. Round your answer to the nearest mile. Click here to see answer by rwm(914)

 Question 444146: 6x - y = 39 6x + 7y=33 Click here to see answer by mananth(12270)

 Question 444319: Trying to help daughter with Algebra homework. Worksheet directions say "factor each quadratics, show work". Example problems include: m^2 - 7m + 6 m^2 + 6m M^2 - m I am completely lost....do we need to factor out or what? HELP! Click here to see answer by htmentor(806)

 Question 444657: Evaluate the following expressions when x=3, y=-2, and z=-1 2-3x/6+2y(x-1/4)-4z Click here to see answer by solver91311(17059)

 Question 444957: 4x^2-146x+520=0 (2x- )(2x- ) I can't seem to find the missing #'s HELP PLEASE!!! Click here to see answer by jorel1380(2518)
 Question 444957: 4x^2-146x+520=0 (2x- )(2x- ) I can't seem to find the missing #'s HELP PLEASE!!! Click here to see answer by htmentor(806)

 Question 445082: what is the solutions of these systems if any? 1) x+7y=62 and -x+2y=10 2) 3x+4y=12 and -3x+y=33 3)4x-8y=1 and 4x-8y=2 Click here to see answer by ewatrrr(10682)

 Question 445209: i'm trying to show a=b or a=1/b without plugging in the values for a. this is the equation a+1/a=b+1/b i have tried multiplying both sides by ab i tried the quadratic equation but that didn't work very well cause i couldn't get the square root out i just need a step by step explanation of how to get there cause its driving me crazy and i think i'm just missing something simple please remember. i know how to substitute. i'm basically proving a= b,1/b which is why i tried making it a quadratic because i knew there were 2 answers thank you very much i hope you can help Click here to see answer by mananth(12270)
 Question 445209: i'm trying to show a=b or a=1/b without plugging in the values for a. this is the equation a+1/a=b+1/b i have tried multiplying both sides by ab i tried the quadratic equation but that didn't work very well cause i couldn't get the square root out i just need a step by step explanation of how to get there cause its driving me crazy and i think i'm just missing something simple please remember. i know how to substitute. i'm basically proving a= b,1/b which is why i tried making it a quadratic because i knew there were 2 answers thank you very much i hope you can help Click here to see answer by AnlytcPhil(1278)

 Question 445312: Select any two integers between -12 and +12 which will become solutions to a system of two equations. Write two equations that have your two integers as solutions. Show how you built the equations using your integers. Your solution and equations should not be the same as those of other students or the textbook. There are infinite possibilities. Solve your system of equations by the addition/subtraction method. Make sure you show the necessary 5 steps. I have never taken a math class higher than Pre-algebra, and that was 35 years ago. I am taking a course online and am having difficulty intrpreting the material. Click here to see answer by stanbon(57940)

 Question 446094: i need help with the steps to complete this.find all numbers for which the rational expression is undefined.(r^3-8r)/(r^2-64) Click here to see answer by stanbon(57940)
 Question 446094: i need help with the steps to complete this.find all numbers for which the rational expression is undefined.(r^3-8r)/(r^2-64) Click here to see answer by Leaf W.(97)

 Question 446176: Solve by the substitution method. 4x+4y=24 -5x-y=24 The solution type in ordered pair. Click here to see answer by mananth(12270)

 Question 446178: Solve by substitution method. 5m+n=23 m-9n=69 Solution type in ordered pair. Click here to see answer by The One(11)

 Question 446820: The path of a baseball is given by ; where f(x) is the height, in feet, of the baseball and x is the horizontal distance, in feet, from the home plate. a) How far from home plate is the ball when it hits the ground? b) What is the height of the ball as it passes over the pitcher's mound, which is about 64 ft. from home plate? c) What is the maximum height of the baseball? All I'm really asking is how do I set up these problems, and, how do I get rid of that .0032? It's really throwing me off! lol Click here to see answer by josmiceli(9817)

 Question 446816: A company manufactures lighting fixtures finds its daily production costs to be: C(x) = .25x²-10x+800 dollars for x fixtures produced daily. Find the minimum daily production cost to the company. I've set it up: -> simplified: -> However, I'm not sure if this is the right way to go with this problem. Click here to see answer by josmiceli(9817)

 Question 447077: The length of a rectangle is one foot less then three times the width. Find the length and width of the area is 30 square feet Click here to see answer by chriswen(106)