Tutors Answer Your Questions about Quadratic Equations (FREE)
Question 762090: Hello. Here are three problems involving the Quadratic Equation that I am having trouble with.
1. Solve the equation using factoring or the quadratic formula, whichever is appropriate.
4/(x+6)+3/(x-6)=1
x=?
2. Solve the equation using factoring or the quadratic formula, whichever is appropriate.
1/(x+6)+1/(x+5)=1
x=?
3. Can the equation x2=11 be solved by factoring? Solve it.
x^2=11
x=?
Click here to see answer by ramkikk66(644)  |
Question 762541: I am having trouble with function notation. Please help!
Q1. Let f(x)=x^2-1, evaluate the following:
a. f(a)-1=?
Q2. Graph the function f(x)=-1/2x-1. Then draw the line x=-3 and the point (-3,f(-3)).
Q3. For the function f(x)=-1/2x+1, find the value of x for which f(x)=x.
Click here to see answer by solver91311(24713)  |
Question 762677: a) show that the equation 0.25x squared - 0.7+ 1.5 =0 does not have any real roots.
b) the line y=2x - 5 and the curve xsquared + xy = 2 intersects at the point A and B, show that the equation to find the points A and B is givin by:
3xsquared - 5x - 2 = 0.
Hence find the coordinates of A and B.
Click here to see answer by malglu(63) |
Question 762753: Can someone please help me solve this equation? Thank You!!!!
Find the maximum Y-value on the graph of Y=f(x)
F(x)=-x^2+10x+9
The maximum Y-value is Y=____
It does not show a graph on the equation so I have no idea what to do with this equation?
Click here to see answer by jim_thompson5910(35256) |
Question 762756: Can someone please help me solve this equation? Thank You!!!!
Use the quadratic formula to find any x intercept on the graph of the equation
y=x^2-6x-4
Type all x intercepts below ,select the correct choice below and dill in any answer boxes within your choice
A) x=_____ ( simplify your answer.Type exact answer, using radicals as needed. Use comma to separate answers as needed)
B) there is no solution
There is no graph to chart so I'm confused.
Click here to see answer by stanbon(75887) |
Question 762755: Can someone please help me solve this equation? Thank You!!!!
To solve by completing the square, what value should you add to each side of the equation?
x^2=2x=-5
What value should be added to both sides of the equation?
( Type an integer or a simplified fraction)
Click here to see answer by Alan3354(69443)  |
Question 762764: A man flies a small airplane from Fargo to Bismarck, North Dakota—a distance of 180 mi. Because he is flying into a head wind, the trip takes him 2 hours. On the way back, the wind is still blowing at the same speed, so the return trip takes only 1 h 15 min. What is his speed in still air, and how fast is the wind blowing?
Click here to see answer by Alan3354(69443) |
Question 762948: I am stuck on a problem and I got one answer where there was no solution.
I kind of understand but not totally. Would like some help and steps taken would be helpful.
Solve using the Quadratic Formula:
3/4x^2 - 2x + 1/2 = 0.
Please help!!!!
Click here to see answer by rothauserc(4718)  |
Question 762948: I am stuck on a problem and I got one answer where there was no solution.
I kind of understand but not totally. Would like some help and steps taken would be helpful.
Solve using the Quadratic Formula:
3/4x^2 - 2x + 1/2 = 0.
Please help!!!!
Click here to see answer by MathTherapy(10549)  |
Question 763047: This is a prob/stat question. Hopefully someone will help since I am so lost right now. Trying to prepare for a test.
In a study the carapace lengths (in mm) of Thenus lobster caught near Singapore measured: 78, 66, 65, 63, 60, 60, 58, 56, 52, and 50 (the population data is approximately normal). Find (round to nearest hundredths):
a. The sample mean = __________ (s = 7.97)
b. The 90% confidence intervals for the population mean _________________.
c. The 70% confidence intervals for the population mean _________________.
d. The 80% confidence intervals for the population mean _________________.
e. How many would they need to sample to be 97% sure to be within 0.07 of the population mean? ______________.
f. How many more (than the original 10) would they need to sample to be 64% sure to be within 0.1 of the population mean? ______________.
Click here to see answer by stanbon(75887) |
Question 763045: The distance between the bases in mega-baseball is 124 ft. Ashlee made a throw from the home plate to first base to get Mark out and Sally threw directly to third base to get Sam out. How far did the ball travel in those two throws? __________
Click here to see answer by stanbon(75887) |
Question 763084: Complete the square (step by step) for: 2x^2-4x+11. I can figure out up to:
2(x^2-2x)+11
2(x^2-2x+1)-1+11
2(x-1)^2+10
But, the answer in the book says: 2(x-1)^2+9. I can't figure out how it's a 9 instead of 10. Help!
Click here to see answer by Cromlix(4381)  |
Question 763137: This is my problem below. I do not understand much of anything that is going on. At points I think I understand it only to be wrong. Please help me. Not only do I need help with this but I also need to be able to do it for myself. Any advise on how would be greatly appreciated!
A researcher predicts that watching a film on institutionalization will change students’ attitudes about chronically mentally ill patients. The researcher randomly selects a class of 36 students, shows them the film, and gives them a questionnaire about their attitudes. The mean score on the questionnaire for these 36 students is 70. The score for a similar class of students who did not see the film is 75. The standard deviation is 12. Using the five steps of hypothesis testing and the 5% significance level (i.e. alpha = .05), does showing the film change students’ attitudes towards the chronically mentally ill?
1.What does it mean to set alpha at .05?
2.What is your null hypothesis? Alternate hypothesis?
3.Is this a one-tailed or two-tailed hypothesis?
4.What is the criterion z?
5.Suppose the obtained z was -2.5. Do you reject or fail to reject the null hypothesis?
6.State in words what you have found.
Number six is where I am having problems the most! How am I suppose to put these number and stuff in words!
This is what I got but fear it is wrong. I also had a little help with just this little bit.
ME:"p" known as "p-value" utilized for testing a "hypothesis"
"0.05" is "confidence level" or "alpha"
For case (p<0.05), this means to accept "null hypothesis" which is the original hypothesis of the problem.
example of null hypothesis: average test score = 75%
example of alternative hypothesis:average test score > 75%
Click here to see answer by rothauserc(4718) |
Question 763418: I need to know what a parabola graph looks like when the parabola will cross the x-axis at 0 and 12. I worked out the problem I just need to know what the graph will look like. I don't understand that part of it.
My problem was: -25x^2 + 300x = 0
25x^2 - 300x = 0
25x (x - 12) = 0
25x = 0 or x -12 = 0
I just need to know how to graph it and see what it looks like. I believe the parabola will open downward because it has a negative value.
Click here to see answer by ramkikk66(644) |
Question 763418: I need to know what a parabola graph looks like when the parabola will cross the x-axis at 0 and 12. I worked out the problem I just need to know what the graph will look like. I don't understand that part of it.
My problem was: -25x^2 + 300x = 0
25x^2 - 300x = 0
25x (x - 12) = 0
25x = 0 or x -12 = 0
I just need to know how to graph it and see what it looks like. I believe the parabola will open downward because it has a negative value.
Click here to see answer by josmiceli(19441)  |
Question 763472: Hello! I'm having trouble with a Quadratic Equation word problem, quite frankly, I don't even know where to start. I know the formula, so I'm confident that I can solve it once it's in an equation form, but I just can't seem to get there. The question is:
Jasmine is a competitive diver. In a dive off an 8m platform, she reaches a maximum height of 8.4m after 0.30 seconds. How long does it take her to reach the water?
Thank's so much for the help, I really appreciate it!
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 763472: Hello! I'm having trouble with a Quadratic Equation word problem, quite frankly, I don't even know where to start. I know the formula, so I'm confident that I can solve it once it's in an equation form, but I just can't seem to get there. The question is:
Jasmine is a competitive diver. In a dive off an 8m platform, she reaches a maximum height of 8.4m after 0.30 seconds. How long does it take her to reach the water?
Thank's so much for the help, I really appreciate it!
Click here to see answer by rothauserc(4718) |
Question 763495: A T-shirt company will place custom logos on shirts. A group must order a minimum of 100 T-shirts to get the price per shirt of $12. But a discount is offered for larger orders. For each set of 10 more shirts, the price of each shirt will decrease by $0.50.
a. Assuming that a group must place a minimum order of 100 shirts, find the equation that models the total cost C(t) for the T-shirts. (Hint: Define t to be the number of sets of 10 T-shirts ordered beyond 100, i.e. t = 2 if 20 more T-shirts are ordered)
Find the equation that models this situation
b. Use the model to find the cost for buying 200 T-shirts.
Click here to see answer by josmiceli(19441) |
Question 763698: Help please! I'm so confused by this problem. Can you explain it step by step?
if an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s
(where h and s are in ft, t is in seconds and v is in ft/sec)
a ball is thrown upward with an initial velocity of 96 ft/sec from the top of a 100 ft bridge. Determine the time that it takes for the ball to get to a height of 200 ft.
Round answers to 2 decimals.
Click here to see answer by josmiceli(19441) |
Question 763757: Help please! I'm so confused by this problem...
if an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s
(where h and s are in ft, t is in seconds and v is in ft/sec)
a package is thrown downward with an initial velocity of -5ft/sec from a helicopter at 300 ft.
a) what is the height of the package in 2 sec?
b) how long does it take to hit the ground?
Click here to see answer by solver91311(24713) |
Question 763757: Help please! I'm so confused by this problem...
if an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s
(where h and s are in ft, t is in seconds and v is in ft/sec)
a package is thrown downward with an initial velocity of -5ft/sec from a helicopter at 300 ft.
a) what is the height of the package in 2 sec?
b) how long does it take to hit the ground?
Click here to see answer by rothauserc(4718) |
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