Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 114157: Chris's wages vary directly as the time she works. If her wages for 20 hours are $150 what is the varation constant? what are the wages for 72.5 hours?
Click here to see answer by stanbon(57261)

Question 114158: write a linear equation in slope intercept form ti nidek the following situation. Angies mother wants to take some adult education classes at the local highschool. she had to pay a one -tiome enrollemment fee of $25 to join the adult education community, and then 45$for each class she wants to take.
Click here to see answer by stanbon(57261)

Question 114156: in 1996 there were aproxmitely 275 students in the Delaware High School band. In 2002, that number increased to 305. Find the annaul rate of change in the number of students in a band.
Click here to see answer by stanbon(57261)

Question 114155: y=-3/2x
Click here to see answer by MathLover1(6625)

Question 114150: One exact x-intercept of y= x^2+kx+1 is 3+2root2.What is the value of k ?
Click here to see answer by stanbon(57261)

Question 114154: y=-2x
Click here to see answer by MathLover1(6625)

Question 114170: What type of solution do you get for quadratic equations where D>0 ?
Click here to see answer by jim_thompson5910(28510)

Question 114254: Solve.
4x squared = 13x + 12
Click here to see answer by MathLover1(6625)

Question 114060: Steve traveled 600 miles at a certain speed. Had he gone 20mph faster, the trip would have taken 1 hour less. Find the speed of his vehicle
Click here to see answer by ankor@dixie-net.com(15639)

Question 114342: There is a question close to this on the board but it is slightly different. Can you please help me.
Thank you.
Solve using the quadratic formula:
3x^2-2x=15x-10
Click here to see answer by stanbon(57261)

Question 114347: I am having a problem with this problem, can you please help clarify. Thank you so much.
Use quadratic formula to solve:
5x^2+5x+1= 0
Thank you in advance for your expertise.
Click here to see answer by solver91311(16872)

Question 114148: A piece of cardboard is 4cm longer than it is wide. From each corner a 2cm square is cut out and the cardboard is then folded to form an open box. What are the dimensions of the cardboard if the box contains 64cm ^3 ?
Click here to see answer by ankor@dixie-net.com(15639)

Question 114437: Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream
Click here to see answer by stanbon(57261)

Question 114393: Suppose a rectangular movie screen has an area of 10416 square feet. Find the dimensions of the screen if it is 19 feet longer than it is wide.
THANKS!
Click here to see answer by bucky(2189)

Question 114515: Vertex (h,k) of the quadratic function f(x)=a(x-h)^+k is (1,2) and the y-intercept is (0,1).
a)Find the quadratic function
b)What is the maximum value of the function?
Click here to see answer by stanbon(57261)

Question 114385: Tickets to a school dance cost $4, and the projected attendance is 300 persons. It is further projected that for every $0.1 increase in ticket price, the average attendance will decrease by 5. At what ticket price will the receipts from the dance be $1218?
If there is more then one solution, separate your answers with commas .
So I've got the formula of:
(4+.10x)(300-5x)=1218
.50x2+10x-18=0
Now I'm stuck. Can someone please help?
Click here to see answer by ankor@dixie-net.com(15639)

Question 114541: The length of a golden retangle is approximately 1.6 times the width. Find the dimensions of a golden rectangle if its area is 9000m^2.
Click here to see answer by checkley71(8403)

Question 114600: x^=-11
Click here to see answer by checkley71(8403)

Question 114521:
f(x)=-x^+4x-3

Graph y=f(x)
Show x-and y-intercepts and vertex on the graph
I actually thought y was f(x) from how it was explained in class, where am I off on this?
Click here to see answer by checkley71(8403)

Question 114605: For this question i have to sketch and label a graph, show all calculations and leave them in either factored or vertex form. I also have to keep 4 decimal places through my solutions and then round final answer to one decimal place. The question is :
A farmer has $2400 to spend on two rectangular pastures as shown to the right. (the diagram is of 2 identical shaped rectangles attatched by one of the length sides). The local contractor will build the fence at a cost of $6.25/m. What is the largest total area the farmer can have fenced for that price??

Click here to see answer by ankor@dixie-net.com(15639)

Question 114533: Rita rows 12km upstream and 12km downstream in 3 hours. The of her boat in still water is 9km/hr. Find the speed of the stream.
Click here to see answer by ankor@dixie-net.com(15639)

Question 114676: Solve by using the quadratic formula:
Z squared + 4z + 1 = 0
Click here to see answer by jim_thompson5910(28510)

Question 114678: Solve by using the quadratic formula:
9z squared + 12z + 4 = 0
Click here to see answer by jim_thompson5910(28510)

Question 114666: 10(–x – 7) + 20 = –5(2x + 4)
Click here to see answer by jim_thompson5910(28510)

Question 114663: 7x – 5 + 3x = 6 + x – 10
Click here to see answer by jim_thompson5910(28510)

Question 114677: John owns a hotdog stand. He has found that his profit is represented by the equation ,, where x is the number of hotdogs. How many hotdogs must he sell to make a profit?
P(x)=x^2+56x+73
Choices:
45 hotdogs
28 hotdogs
56 hotdogs
73 hotdogs
Thank you.
Click here to see answer by edjones(7569)

Question 114667: 7x(3x+4)=8(2x+5)+13
Click here to see answer by edjones(7569)

Question 114519: f(x)=-x^2+4x-9
Find the vertex
What is the extremum value of the function?
Click here to see answer by HyperBrain(694)

Question 114734: Graph the inequality.
y is equal to or greater then 1

Click here to see answer by MathLover1(6625)

Question 114734: Graph the inequality.
y is equal to or greater then 1

Click here to see answer by jim_thompson5910(28510)

Question 114744: Graph by first solving for y.
x – 3y = 9

Click here to see answer by jim_thompson5910(28510)

Question 114788: Write the equation of the line passing through (–3, –5) and (3, 0).
Click here to see answer by jim_thompson5910(28510)

Question 114681: An L- shaped sidewalk from the parking lot to a memorial is as follows:
The distance directly across the grass to the memorial is 650 ft.
The distance to the corner of the "L" is 600 feet.
Find the distance from the corner of the "L" to the memorial.
Click here to see answer by ankor@dixie-net.com(15639)

Question 114900: consider the sum of squares x^2+9.if this sum can be factored, then there are intergers m and n such that x^2+9=(x+m)(x+n). write two equationa relating the sum of m and n to the coefficients in x^2+9.
show that there are no intergers m and n that satisfy both equations you wrote in part (a). what can you conclude?
Click here to see answer by stanbon(57261)

Question 114913: Why are there usually two solutions in quadratic equations?
Click here to see answer by Edwin McCravy(8883)

Question 114388: Solve the following quadratic equation.
4x squared = 13x + 12
Click here to see answer by jim_thompson5910(28510)

Question 114970: find y intercept and vertex: y = x^2 - 4x + 5
Click here to see answer by HyperBrain(694)

Question 115226: I do not think my question posted so I am going to try again. Here is the equation 3x^2-2x+1=0. I am confused by my answer: -2 +/- sqr rt -8,over 6. Is this the correct answer and if so do I leave it or break it down further?
Click here to see answer by jim_thompson5910(28510)

Question 115257: 17000=130000+D/(10.83) I don't how to seperate variable and can I multiply both sides by 10.83 after moving D, or do I have to do something else first?
Click here to see answer by stanbon(57261)

Question 115318: I am having problems fiquiring out how i(1+i)^3 *(1-i) is equal to -4. I am required to show work... When I type the equation into my calculator it comes out -4. How so?
Thanks,
Mike
Click here to see answer by stanbon(57261)

Question 115339: the directions on this work sheet is use the quadratic formula to solve each equation and the equation is m^2+5m-6=0 i dont understand how to figure it out so if you could give me directions so that i know how to get the answer i would be greatly appriciated! thanks
Click here to see answer by aka042(26)

Question 115468: factor
8x^3y^5+16y^3x^5-40x^4y^4

Click here to see answer by jim_thompson5910(28510)

Question 115472: find the axis of symentry of the parabola defined by the given quadratic function.
f(x)= x^2+5
Click here to see answer by scott8148(6628)

Question 115642: Algebra 1 chapter 9 Resource Book lesson 9.3 Practice A
I am having dificulty trying to figure out the coordinates to a problem that contains an a, b, c and even more when b and c are sometimes missing.
Find the coordinates of the vertex.
1. y= 3x²
2. y= 5x²-1
3. y= x²+6x

Click here to see answer by vertciel(183)

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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, 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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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