Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 123304: If f(x) = 3x^2 + 2x – 7 represents the attitude score f(x) for a
person x years old, find and interpret f(30).

Click here to see answer by chitra(359)

Question 123395: I am having a very hard time trying to figure this out. Can you please help me?
Find the axis of symmetry.
y = -x squared + 6x - 2
Click here to see answer by Fombitz(13828)

Question 123394: I am having a very hard time trying to figure this out. Can you please help me?
I am sorry, I forgot to put in there what it is I need to do with the problem.
Find the axis of symmetry.
y = x squared - 5x + 3
Click here to see answer by checkley71(8403)

Question 123608: The data in the table shows the height in metres above the ground of a snowball at various times. Showing all work algebraically, create a function that represents the height of the snowball after t seconds.
TIME(sec)--- 1,2,3,4,5
HEIGHT(m)---25.1,38.4,41.9,35.6,19.5
Can someone please help me?
Click here to see answer by Edwin McCravy(8880)

Question 123616: Local building codes require that a rectangular factory building must be surrounded by a parking lot of uniform width. The total area occupied by the factory and the parking lot must be double the factory area. If the factory is to be 80m wide and 120m long. How wide must the parking lot be? HELP:)
Click here to see answer by checkley71(8403)

Question 123613: Write two equations whose roots have a sum of -2/3 and a product of 1/2.
Click here to see answer by checkley71(8403)

Question 123618: A certain radioactive element decays to 1/2 of its original amount every 20 years. If there was 100mg to start with, how much will be present after 200 years? Set up an equation and solve the problem. Can someone please help me ??
Click here to see answer by stanbon(57220)

Question 123615: Find the value(s) of k if the equation 3k^2+5x+2=0 have no real roots.
Click here to see answer by stanbon(57220)

Question 123486: John used completing the square to find the zeros of the function y=9x^2-12x-33. Can someone please show please show me the steps for solving this ???
Click here to see answer by ankor@dixie-net.com(15624)

Question 123803: The cost per hour of running an assembly line in a manufacturing plant is a function of the number of items produced per hour. The cost function is C(x)=0.3x^2-1.2x+2, where c(x) is the cost per hour in thousands of dollars, and x is the number of items produced per hour, in thousands. Determine the most economical production level.
Click here to see answer by stanbon(57220)

Question 123806: Determine the maximum or minimum value of the quadratic function.
f(x)=x^2-6x+2
Click here to see answer by stanbon(57220)

Question 123806: Determine the maximum or minimum value of the quadratic function.
f(x)=x^2-6x+2
Click here to see answer by rapaljer(4667)

Question 123833: Solve.
x squared - 4x = 12
Click here to see answer by solver91311(16868)

Question 123834: Find the x-intercept of y = x squared - 3x - 10
Click here to see answer by solver91311(16868)

Question 123798: Please help me, i need to know how to solve this for a test tommorow!
What are the zeros of f(x)=-3(x-2)^2 + 5

Click here to see answer by rapaljer(4667)

Question 123842: What formula do you use to put this in vertex form where you can graph it? What are the "zeros" of this equation? and how do you find the "zeros".

f(x)=-3(x-2)^2+5
Click here to see answer by rapaljer(4667)

Question 123857: how do you express f(x)=-3(x-2)^2+5 in standard form? What formula do you use?
Click here to see answer by stanbon(57220)

Question 123857: how do you express f(x)=-3(x-2)^2+5 in standard form? What formula do you use?
Click here to see answer by johnnico6426(16)

Question 123857: how do you express f(x)=-3(x-2)^2+5 in standard form? What formula do you use?
Click here to see answer by solver91311(16868)

Question 123828: Solve.
x squared + 7 = 15
Click here to see answer by chitra(359)

Question 123863: A right triangle has a height 8cm more than twice the base. If the area of the triangle is 96cm^2, what are the dimensions of the triangle?
Click here to see answer by solver91311(16868)

Question 123886: directions: find the roots of the quadratic equation y=x^2+7x-18 by factoring. choose the correct answer. A)7,9 B)9,2 C)-7,-9 D)-9,2. which one is the answer?
Click here to see answer by chitra(359)

Question 123885: directions: find the roots of the quadratic equation y=x^2+7x-18 by factoring. choose the correct answer. A)7,9 B)9,2 C)-7,-9 D)-9,2. which one is the answer?
Click here to see answer by chitra(359)

Question 123884: directions: find the roots of the quadratic equation y=x^2+3x+2 by factoring. choose the correct answer. A)1,-2 B)-2,-1 C)0,-2 D)1,-1. which one is correct?
Click here to see answer by chitra(359)

Question 123883: directions: write the quadratic equation for the set of roots 4,-6. choose the correct answer. A)x^2+24x+10 B)x^2-2x-24 C)x^2-24x-2 D)x^2+2x-24. which one is correct?
Click here to see answer by applesrbest(7)

Question 123835:
Find the axis of symmetry of y = -x squared - 6x + 2
Click here to see answer by bucky(2189)

Question 123941: Avoing a collision. a car is traveling on a road that is perpeendicular to a railroad track.when the car is 30 meters from the crossing,the cars new collision detector warns the driver that is a train 50 meters from the car and heading toward the same crossing. how far is the train from the crossing?
Click here to see answer by solver91311(16868)

Question 123953: y=-x^2+3x-3
Click here to see answer by solver91311(16868)

Question 123952: y=-x^2+1
x | y
______
-2 |
______
-1 |
______
0 | 1
______
1 |
______
2 |
Click here to see answer by solver91311(16868)

Question 123975: Decide all values of b in the following equations that will
give one or more real number solutions.
1. 3x^2+bx-3=0
2. 5x^2+bx+1=0
3. -3x^2+bx-3=0
4. Write a rule for judging if an equation has solutions by looking at it in standard form.
Click here to see answer by checkley71(8403)

Question 123986: Solve the following quadratic equations. (x - 1)^2 = 7
Click here to see answer by checkley71(8403)

Question 123826: A bus company has 4000 passengers daily, each paying a fare of $2. For each $.015 increase, the company estimates that it will lose 40 passengers per day. If the company needs to take in $10,450 per day to stay in business, what fare should be charged?

The answer supposedly should be $2.75 ???
Click here to see answer by ankor@dixie-net.com(15624)

Question 124010:
Solve the following quadratic equation. 4x^2-8x-2
Click here to see answer by checkley71(8403)

Question 124043: A grocery store is selling ground beef for $1.89 per pound
How much does it cost to buy 2.5 pounds? Round your answer to the nearest cent.
Click here to see answer by stanbon(57220)

Question 124065: Solve.
(x + 7)squared = 13
Click here to see answer by stanbon(57220)

Question 124284: Graph the quadratic equation after completing the given table of values.
y = –x^2 + 1
x y
–2 -3
–1 0
0 1
1 2
2 5
First did I do the table right? And I have no idea how to graph this on the computer.
Click here to see answer by Fombitz(13828)

Question 124292: Solve the following quadratic equation by completing the square.
2x^2+10x+11=0
Click here to see answer by jim_thompson5910(28476)

Question 124292: Solve the following quadratic equation by completing the square.
2x^2+10x+11=0
Click here to see answer by edjones(7569)

Question 124292: Solve the following quadratic equation by completing the square.
2x^2+10x+11=0
Click here to see answer by stanbon(57220)

Question 124289: Solve the following quadratic equation by completing the square. I get the first part then i get lost, please help me. x^2-6x-3=0
Click here to see answer by edjones(7569)

Question 124289: Solve the following quadratic equation by completing the square. I get the first part then i get lost, please help me. x^2-6x-3=0
Click here to see answer by jim_thompson5910(28476)

Question 124287: The height h in feet of an object after t seconds is given by the function
h = –16t^2 + 30t + 3. How long will it take the object to hit the ground? Round your answer to the nearest thousandth
Click here to see answer by jim_thompson5910(28476)

Question 124298: Use the quadratic formula to solve the following quadratic equation.
2x^2-5x=3
Click here to see answer by jim_thompson5910(28476)

Question 124302: Use the quadratic formula to solve the following quadratic equation.
3x^2-2x+1
Click here to see answer by jim_thompson5910(28476)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 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7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 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