Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE) Get help from our free tutors ===> Algebra.Com stats: 2016 tutors, 419901 problems solved View all solved problems on Quadratic_Equations -- maybe yours has been solved already! Become a registered tutor (FREE) to answer students' questions. Click here to see problems AND answers on one page Question 121505: What is the general form of the equation: -1/2(y+2)=(x-4)^2? Click here to see answer by checkley71(8403)   Question 121509: Old MacDonald wants to build a rectangular pen for his animals. He has 40m of fencing and he plans to use the barn as one side for his pen. What dimensions will give the maximum area? Click here to see answer by checkley71(8403)   Question 121511: The fromula A=30(0.46)^t describes the amount of ASA in a typical patient's bloodstream in mg/cm^3 in terms of the time t in hours after the peak dosage.Make a table of values and draw the graph of this function. Can someone please help me ??? Click here to see answer by ankor@dixie-net.com(15659)   Question 121506: What tpye of polynomial sequence has a common difference at D2? Is it linear,quadratic,cubic, or quartic? Click here to see answer by stanbon(57377)   Question 121510: Given the quadratic equation x^2-15=2k(x-4), find k if there are two real and equal roots. Click here to see answer by stanbon(57377)   Question 121510: Given the quadratic equation x^2-15=2k(x-4), find k if there are two real and equal roots. Click here to see answer by bucky(2189)   Question 121508: Which function represents the data in the following table of values? a) x- 0,1,2,3 y- 24,12,6,3 Is it (a)y=24(0.5)^1/x ,(b)y=24(2)^x ,(c) y=12(0.5)^x, or (d) y=24(0.5)^x b) x-0,3,6,9 y-5,10,20,40 Is it (a) y=5(2)^x ,(b)y=5(3)^x ,(c) y=5(2)^x/3,or (d) y=5(3)^x/2 Click here to see answer by stanbon(57377)   Question 121500: What type of function does the following table of values represent? x- -21,-18,-15,-12,-9 y- 3,6,12,24,48 Is it arithmetic,quadratic, cubic, or exponential? Click here to see answer by stanbon(57377)   Question 121503: Use completing the square to find the zeros of the function y=9x^2-12x-33. Click here to see answer by MathLover1(6634)   Question 121458: i'm sorry, i left ouy sq 2.the question again was solve the quadratic formula for 6x^2+3x-18=0. help Click here to see answer by algebrapro18(206)   Question 121714: Joey did an experiment in which he measured the temperature(T) of a cup of hot chocolate, in degrees celcius, with respect to time(t), in minutes. He found that the function T=33(0.28)^t/26 +24 described the relationship. What was the room temperature of the room in which it was placed to cool? I think it is 24 degrees celcius, does anyone know this one ? Click here to see answer by stanbon(57377)   Question 121713: What is the correct mapping rule to show the transformation of y=2^x for the equation 1/4(y-5)=2^2x-3 ? Can someone please help, I've been stuck for a few days on this one.I'm guessing: (x,y)-(x+3),(4y+5), anyone know? Click here to see answer by stanbon(57377)   Question 121711: What Transformation of y=2^x results in the equation 1/5(y-3)=2^-(x-4)? Is it: a)horizontal translation of 4,vertical translation of 3,stretch of 5, reflection in x-axis b) ht of -4,vt of 3, stretch of 5, reflection in x-axis c) ht of 4,vt of 3, stretch of 5, reflection in y-axis d) ht of -4,vt of 3, stretch of 5, reflection in y-axis Can someone please help me?????? Click here to see answer by stanbon(57377)   Question 121710: Find the value of c so that the quadratic equation 2x^2+4x-c=0 has two equal real roots. Can someone please help me ? I think the answer is -1/2 but I'm not sure ?!!? Click here to see answer by Fombitz(13828)   Question 121705: Find the root(s) of : 8/x-3 -3= 2-3x/x=3 (Note: the subtract 3 is not part of the denominator) Can someone PLEASE help me with this??? Click here to see answer by Fombitz(13828)   Question 121712: Simplify: a) (3/4)^-2 +(2/5)^0 -(4/3)^2 b) (x^-1 + y^-2)^-2 Click here to see answer by checkley71(8403)   Question 121712: Simplify: a) (3/4)^-2 +(2/5)^0 -(4/3)^2 b) (x^-1 + y^-2)^-2 Click here to see answer by MathLover1(6634)   Question 121704: Bacteria has a tripling time of 8 minutes. If there were initially 24 spores of bacteria on a hamburger, how many spores will be present after one hour ? Click here to see answer by bucky(2189)   Question 121706: What is the horizontal asymptote of the function y=4(2^x)+3? Can someone please help me?? Click here to see answer by stanbon(57377)   Question 121755: The equation h=-16t^2 + 112t gives the height of an arrow, shot upward from the ground with an initial velocity of 112ft/s, where t is the time after the arrow leaves the ground . Find the time it takes for the arrow to reach a height of 180 ft? t = 180/112 t = 1.6 seconds Not sure if I'm doing the problem right but just double checking. Click here to see answer by jim_thompson5910(28598)   Question 121755: The equation h=-16t^2 + 112t gives the height of an arrow, shot upward from the ground with an initial velocity of 112ft/s, where t is the time after the arrow leaves the ground . Find the time it takes for the arrow to reach a height of 180 ft? t = 180/112 t = 1.6 seconds Not sure if I'm doing the problem right but just double checking. Click here to see answer by algebrapro18(206)   Question 121757: The demand equation for a certain printer is given by D = -200p +35,000 The supply equation is predicted to be S = -p^2+ 400p - 20,000 Find the equilibrium price? I just need some help on how to start this problem. Click here to see answer by jim_thompson5910(28598)   Question 121854: This problem seems very simple but I have been stuck on it for 20 minutes and I don't know why! x^2-x=0 The solution given is x=(0,1) but I do not understand how it was derived. Thankyou! First you need to look how can you break this down. so x^2-x = 0, well if you factor out x you have x(x-1)= 0. That means either that x = 0 or x-1=0 solve for x and x = 0 or 1 Click here to see answer by checkley71(8403)   Question 121854: This problem seems very simple but I have been stuck on it for 20 minutes and I don't know why! x^2-x=0 The solution given is x=(0,1) but I do not understand how it was derived. Thankyou! First you need to look how can you break this down. so x^2-x = 0, well if you factor out x you have x(x-1)= 0. That means either that x = 0 or x-1=0 solve for x and x = 0 or 1 Click here to see answer by jecegc(3)   Question 121868: Solutions of: 2X^2-5X-3=0 Click here to see answer by MathmaticsMaster(2)   Question 121879: Use the quadratic formula to solve 2x squared - 5x = 3 3x squared - 2x + 1 = 0 Click here to see answer by MathmaticsMaster(2)   Question 121936: SOLVE BY SUBSTITUTION 5X-2Y=-5 Y-5X=3 Click here to see answer by jim_thompson5910(28598)   Question 121932: solve the following systems by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent. X+5Y=10 -2X-10Y=-20 Click here to see answer by jim_thompson5910(28598)   Question 121932: solve the following systems by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent. X+5Y=10 -2X-10Y=-20 Click here to see answer by rapaljer(4667)   Question 121968: The length of a rectangle is 1cm longer than its width. If the diagonal of the rectangle is 4cm, what are the dimensions(the length and width) of the rectangle? x + (x+1)= 4 Am I on the right track in solving this problem? Click here to see answer by oscargut(891)   Question 121978: A rectangular flower bed is to be constructed along the front of a house.If there is 30m of landscaping border to be used along the side of the house, determine the dimensions of the flower bed and the maximum area which can be enclosed. I began with 30=2w+l 30-2w=l and my teacher said this was right so far but I don't know what to do next:( Click here to see answer by oscargut(891)   Question 121978: A rectangular flower bed is to be constructed along the front of a house.If there is 30m of landscaping border to be used along the side of the house, determine the dimensions of the flower bed and the maximum area which can be enclosed. I began with 30=2w+l 30-2w=l and my teacher said this was right so far but I don't know what to do next:( Click here to see answer by stanbon(57377)   Question 121978: A rectangular flower bed is to be constructed along the front of a house.If there is 30m of landscaping border to be used along the side of the house, determine the dimensions of the flower bed and the maximum area which can be enclosed. I began with 30=2w+l 30-2w=l and my teacher said this was right so far but I don't know what to do next:( Click here to see answer by bucky(2189)   Question 121999: A rectangular play enclosure for some dogs is to be made with 60m of fencing using the kennel as one side of the enclosure. Algebraically determine the quadratic function that models the area of the enclosure and use it to find the dimensions that produce the maximum area. Click here to see answer by checkley71(8403)   Question 122023: How do I go about solving this equation x^4 – 3x^2 + 2 = 0 when I can't use the formula ax^2+bx+c=0 because the degree is 4? Click here to see answer by Earlsdon(6287)   Question 122005: If a Honda Prelude bought in 2000 cost $32000 and depreciates at a rate of 20% per year, and a Chevrolet Corvette bought in 1994 cost $43000 and depreciates at a rate of 15% per year, algebraically determine which car is worth more in 2005. Click here to see answer by Fombitz(13828)   Question 122161: A rocket is launched into the air. The height in feet, of the rocket, above the ground is given by h(t)=-4.9t(squared) + 192t, where t represents the time in seconds after the launch. (Hint:draw a picture) #1. How long is the rocket in the air before it reaches the ground? #2. How long does it take the rocket to reach its highest point? #3. How high is the rocket at its highest point? I know that to find this answer I use the formula for the line of symmetry, and the vertex is the highest point..I think that it is 19.6 feet if I did it right. The other questions I do not know how to do. Thank you! Click here to see answer by josmiceli(9697)   Question 122246: Solve: 9^(3x-1)=81^(-x+1) Click here to see answer by Fombitz(13828)   Question 122244: A radioactive isotope has a half-life of 3000 years. If a sample of this isotope origanally has a mass 30g, what equation would model the mass of this sample over time? What would its mass be after 5 hours? Click here to see answer by Edwin McCravy(8909)   Question 122125: Solve using the quadratic formula 3x squared - 2x + 1 = 0 Click here to see answer by bucky(2189)   Question 122247: An investment of $2000 earns an annual interest rate of 4%.What will be the value of the investment after 5 years? Click here to see answer by stanbon(57377)   Question 122243: Algebraically solve: 70=6+8(^3x-1) Click here to see answer by jainenderkapoor(61)   Question 122123: Use the quadratic formula to solve. 2x squared - 5x = 3 Click here to see answer by madhan_math(34)   Question 122123: Use the quadratic formula to solve. 2x squared - 5x = 3 Click here to see answer by praseenakos@yahoo.com(507)   Question 122245: A cup of coffee is poured and left to cool on the counter. The formula that represents the temperature of the coffee over time is given by T=80(0.9)^(x/2)+20 where T is temperature in degrees celcius, and x is time in minutes. a) What was the initial temperature of the coffee? b) How quickly is it cooling? c) What is the coolest temperature the coffee will reach? How quickly? d) What is the temperature of the coffee after 10 minutes? Click here to see answer by stanbon(57377)

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