Tutors Answer Your Questions about Quadratic Equations (FREE)
Question 204681: how do you know if a quadratic equation will have one, two or no solutions? If only given the solution, how do you find a quadratic equation? Is it possible to have different quadratic equations with the same solution?
Click here to see answer by stanbon(75887)  |
Question 204672: Can you help me solve this question: 1)George is building a porch wrapped around his whole house. The dimensions of his house are 120m by 160m. If his porch is going to be the same area as his house, how wide will the porch be?
Click here to see answer by nerdybill(7384)  |
Question 204724: solve by using quadratic formula (((6x2+3x-18=0)))
my answer is x=-2 3/2
-b+- sq root of b^2-4ac/2a
a=6
b=3
c=18
so -3+-sqrt[9-4(6)(-18)]/12
-3+-sqrt(441)/12
(-3+-21)/12 and x=(-3-21)/12
x=-3+21/12 and x=-3-21/12
x=18/12=3/2 and x=-2
this is how I came up with this answer is this right?
Click here to see answer by lazi(15) |
Question 204725: solve by using quadratic formula (((6x2+3x-18=0)))
my answer is x=-2 3/2
-b+- sq root of b^2-4ac/2a
a=6
b=3
c=18
so -3+-sqrt(9-4(6)l-18/12
-3t-sqrt9441)/12
-3+-21/12 and x=-3-21/12
x=-3+21/12 and x=-3-21/12
x=18/12=3/2 and x=-2
this is how I came up with this answer is this right?
Click here to see answer by Earlsdon(6294) |
Question 204725: solve by using quadratic formula (((6x2+3x-18=0)))
my answer is x=-2 3/2
-b+- sq root of b^2-4ac/2a
a=6
b=3
c=18
so -3+-sqrt(9-4(6)l-18/12
-3t-sqrt9441)/12
-3+-21/12 and x=-3-21/12
x=-3+21/12 and x=-3-21/12
x=18/12=3/2 and x=-2
this is how I came up with this answer is this right?
Click here to see answer by Alan3354(69443)  |
Question 204736: y=x^2 + 4x -5 =0
a) without solving the equation or factoring, determine the solution(s) to the equation. x^2 +4x -5 =0
b) does this function have a maximum or minimum?
c) what are the coordinates of the vertex in (x,y) form?
d) what is the equation of the line of symmetry?
Click here to see answer by stanbon(75887) |
Question 204830: I am having problems with this question, please could you help me to understand it?
I open a bottle of champagne and release the cork vertically from the bottle. The height in metres of the cork above the level of the ground at time (t) seconds is modelled by the equation
h = 1 + 8t - 5t^2.
a) find the height of the cork after 0.8s....i have the answer of 4.2m for this.
b) find the time when the cork is at ground level (h = 0)......i have the answer of 1.72s for this.
c) explain what the maximum value of t is for which this function is a plausible model for the height of the cork?....i don't understand this question.
hope you can help me by explaining how to do this
thank you
Dawn
Click here to see answer by nerdybill(7384) |
Question 204879: I need help with this quadratic equation please:
When a ball is thrown, its height in meters h after t seconds is given by the equation h= vt-5t^2 where v is the initial upwards velocity in meters per second. If meters per second, find all values of t for which h=1 meter. Do not round any intermediate steps. Round the answer to 2 decimal places.
My try: Not even sure where to start..
Click here to see answer by Alan3354(69443) |
Question 204893: When graphing a linear inequality, how do you know if the inequality represents the area above the line?
What are the necessary and sufficient conditions for inequalities to represent an area in the first quadrant?
Click here to see answer by stanbon(75887) |
Question 204936: I need a real life example of a quadratic function.
Equation:
x represents ____________________
y represents _____________________
First point: (x1,y1). ________________
Second point: (x2,y2). ________________
Thank you
Click here to see answer by stanbon(75887) |
Question 204982: Can you please help me with this problem, I have tried to follow the steps of elimination but i get stuck when I have to solve y by multiplying on each side. thank you.
Johns Lumber can convert logs into either lumber or plywood. In a given day, the mill turns out twice as many units of plywood as lumber. It makes profit of $20 on a unit of lumber and $50 on a unit of plywood. How many of each unit must be produced and sold in order to make a profit of $12360?
Johns lumber must produce and sell how many units of lumber, and how many units of plywood to make a profit of $12,360
Click here to see answer by stanbon(75887) |
Question 204998: Plese help me understand this problem, I know that there should be $10.75 left after the purchase but how would i figure out the rest of the problem?
Problem:
A student makes a $9.75 purchase at the bookstore with a $20 bill. the store has no bills and gives the change in quarters and fifty cent pieces. their are 30 coins in all. how many of each kind are there? How many quarters are there in the change?
Click here to see answer by Alan3354(69443) |
Question 204998: Plese help me understand this problem, I know that there should be $10.75 left after the purchase but how would i figure out the rest of the problem?
Problem:
A student makes a $9.75 purchase at the bookstore with a $20 bill. the store has no bills and gives the change in quarters and fifty cent pieces. their are 30 coins in all. how many of each kind are there? How many quarters are there in the change?
Click here to see answer by stanbon(75887) |
Question 205038: Hello, I have this problem to solve, I have tried to do the equation for it, but I am unsure if it correct. Can you please help me.
Problem:
Part a
The sales representative informs you that there are two floor plans still available, and that there are a total of 56 houses available. Use x to represent floor plan#1 and y to represent floor plan #2. Write an equation that illustrates the situation.
( I wrote x+y=56)
Part b
The sales representative later indicates that there are 3 times as many hours available with the second floor plan that the first. Write an equation that illustrates this situation. Use the same variables you used in part a.
(I wrote x + 3y=56)
Please clarify this for me. I appreciate it.
Click here to see answer by rfer(16322) |
Question 205046: Hello. I am trying to figure out 6x^2+42x=0. I don't understand when they say factor out the 6x and how they get to 6x(x+7)=0. Can you explain step by step what factor out 6x means and how you do it? Thanks.
Click here to see answer by rfer(16322) |
Question 205039: I am having a hard time trying to solve this problem, can you please help. thanks.
Problem:
Jim decides to hire a moving compnay, but is unsure which company to choose. Jim is interested in contacting two companies, Heavy Lifters and Quick movers, to discuss their rates. Heavy lifters charges an $80 fee plus $35 per hour. Quick movers charges $55 per hour with no additional fees. Which mover provides a better deal for 2 hours of work? Which mover provides a better deal for 15 hours of work? For what values h(hours) does Quick movers offer the better deal. Express answer in an inequality.
Click here to see answer by Earlsdon(6294) |
Question 205035: I would like some help with this problem:
The admission to the Coney Island Amusement Park is $1.80 for children, and $5.00 for adults. On Saturday, 2,500 people went to the amusement park and $6,050 was collected. How many children and adults attended the amusement park?
Click here to see answer by Alan3354(69443) |
Question 205034: I need help in solving this equation:
Sally sells cookies at cost of 3 for a $1.00 and mini cakes for $5.00 each. Sally wants to sell 5 baskets that include all two products for $15.00. How many cakes and cookies does Sally need to make for her baskets?
Thank you.
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 205110: The path of a falling object is given by the function where represents the initial velocity in ft/sec and represents the initial height. The variable t is time in seconds, and s is the height of the object in feet.
a) If a rock is thrown upward with an initial velocity of 32 feet per second from the top of a 40-foot building, write the height equation using this information.
b) After how many seconds will the rock reach maximum height? Show all work.
c) What is the maximum height? Show all work.
Click here to see answer by Alan3354(69443) |
Question 205148: Hi, I need help solving this problem.
A rectangular piece of cardboard 11 inches by 14 inches is made into a box by cutting idential squares from each corner and folding up the sides. If the bottom of the box turns out to haave an area of 80 in^2, what size squares were cut from the corners?
I am setting up my problem as: 80 = (w-11)(w-14) but I am not sure if I am barking up the wrong alley (so to speak). Any help or suggestions would be greatly appreciated.
Thank you - Lori
Click here to see answer by checkley77(12844) |
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