Tutors Answer Your Questions about Quadratic Equations (FREE)
Question 209698: Bill can row 3 mph in still water. It takes him 3 hours 36 minutes to go 3 miles upstream and return. Find the speed of the current.
I've gone over and over trying this problem different ways. I've converted the time into 216 minutes and still can't figure out what I'm doing wrong.
Click here to see answer by Alan3354(30993)   |
Question 209753: the manager of farmers delight bought a load of watermelons for $750 and priced the watermelons so that he would make $2 on each melon. when all but 100 of the melons had been sold, he broke even. how many did he originally buy?
Click here to see answer by 314(4) |
Question 209809: I have a word problem I need help figering out. I need help on it asap. Please explain how you got the answer.
Looking out on the balcony of a cabin I see a lake were I can go fishing. My cabin balcony is on the 3rd floor. Using formula d=√[3h/2]. I want to find how far away the lake is from my cabin. I say I am about 36 feet up.
Click here to see answer by nyc_function(2733)  |
Question 210011: High concentrations of Carbon Monoxide (CO) can cause coma and possible death. The time required for a person to reach a COHb level capable of causing a coma can be approximated by the quadratic model. T=.0002x^2 - .316x + 127.9, where T is the exposure time in hours necessary to reach this level and 500<= x <=800 is the amount of carbon monoxide present in the air in parts per million (ppm).
Estimate the approximate concentration of (CO) necessary to produce a coma in 4 hrs?.
Click here to see answer by stanbon(57307) |
Question 210045: A rocket is launched from atop a 43-foot cliff with an initial velocity of 70 feet per second. The height of the rocket t seconds after launch is given by the equation h = -16t^2 + 70t + 43. Graph the equation to find out how long after the rocket is launched it ill hit the ground. Estimate your answer to the nearest tenth of a second.
Click here to see answer by Alan3354(30993) |
Question 210170: The mat around a picture measures (x) inches across. The mat is 37 inches long and 24 inches wide. The area of the picture itself is 300 square inches. set up an equation that expresses the area of the picture in terms of the thickness of the mat, (x).
My answer is (37-x)(24-x)=300, but i dont think its right.
Click here to see answer by scott8148(6628)  |
Question 210195: An object is moving in a straight line. It initially travels at a speed of 9 meters per second, and it speeds up at a constant rate of 2 meters per second each second. Under such conditions, the distance d, in meters, that the object travels is given by the equation d = t^2 + 9t, where t is in seconds. According to this equation, how long will it take the object to travel 22 meters?
Click here to see answer by Alan3354(30993) |
Question 210198: An object is launched straight up into the air at an initial velocity of 64 feet per second. It is launched from a height of 6 feet off the ground. Its height H, in feet, at t seconds is given by the equation H = -16t^2 + 64t + 6. Find all times t that the object is at a height of 54 feet off the ground.
Click here to see answer by Alan3354(30993) |
Question 210229: A building is 2 feet from a 9-foot fence that surrounds the property. A worker wants to wash a window in the building 13 feet from the ground. The worker decides the ladder should be placed 8 feet from the fence for stability.
To the neasrest foot, how long of a ladder will be needed?
Click here to see answer by stanbon(57307) |
Question 210320: The formula s=16t^2 is used to approximate the distance, s, in feet that an object falls freely in t seconds. Use this formula to sole the problem:
A man drops his keys off a building 1420 feet high. How long does it take the keys, falling freely to hit the ground?
Click here to see answer by Earlsdon(6287) |
Question 210174: A kite is flying on 52 feet of string. How high is it above the ground if it's height is 28 feet more than the horizontal distance from the person flying it? Assume the string is being released at ground level.
Click here to see answer by Earlsdon(6287) |
Question 210323: sorry I already ask this question but i cannot find it again
(x+ 1/x)^2 -2(x+ 1/x)+1=0 this part of equation in quadratic form
I already got an answer x^4-2x^3+3x^2-2x+1=0 But i got stuck here i dont know what to do next
thank you for your help
Click here to see answer by jim_thompson5910(28593) |
Question 210348: An object is launched straight up into the air at an initial velocity of 64 feet per second. It is launched from a height of 6 feet off the ground. Its height H, in feet, at t seconds is given by the equation H = -16t^2 + 64t + 6. Find all times t that the object is at a height of 54 feet off the ground.
Click here to see answer by Alan3354(30993) |
Question 210350: An object is moving in a straight line. It initially travels at a speed of 6 meters per second, and it speeds up at a constant acceleration of 4 meters per second each second. The distance d, in meters, that this object travels is given by the equation d = 2t^2 + 6t, where t is in seconds. According to this
equation, how long will it take the object to travel 108 meters?
Click here to see answer by Alan3354(30993) |
Question 210380: Use the quadratic formula to determine the x intercepts (if any) of the following function. Then evaluate the function for several values of x, and use the resulting points to graph the function. Show your work.
f(x)=7x^2-2
I have already come up with what I believe is the solution of the quadrtic,
x=0.534 x= -0.534.I don't understand how to get the other points on the graph and have it look like it's supposed to.
Thanks
Click here to see answer by Earlsdon(6287) |
Question 210380: Use the quadratic formula to determine the x intercepts (if any) of the following function. Then evaluate the function for several values of x, and use the resulting points to graph the function. Show your work.
f(x)=7x^2-2
I have already come up with what I believe is the solution of the quadrtic,
x=0.534 x= -0.534.I don't understand how to get the other points on the graph and have it look like it's supposed to.
Thanks
Click here to see answer by vleith(2825) |
Question 210452: Good afteroon. I have a question regarding completing the square. Here is the equation: 
I keep coming up with x= 1 plus minus .816 but in class the answer was x=3+square root 6 over 3 and x=3-square root 6 over 3. Does that seem correct? If so I just don't know how it got that way? Any help would be appreciated. :)
Click here to see answer by tutor_paul(490)  |
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