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Word problem |
2000-01-24 |
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From April:
Ok, my algerbra teacher gave me this problem and by just looking at it I can tell what the answer is but he wants me to show how I got the answer in an equation form. The tempature at 7am on a cold day was -4 degrees Celcius. At 3pm the tempature was 1 degree Celcius. Write and solve an equation to find out how many degrees the tempature rose between 7am and and 3pm.
Answered by Penny Nom. |
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Functions |
2000-01-23 |
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From Tara:
Hi my name is Tara, I have two math problems that I need help with in my calculus math class. - If f(x)= x - 2 show that (x+3)f(x)-(x+2)f(x+1)+4=0
- Graph this function and use the graph to determine the range y=2x2 - 8x - 3
Answered by Harley Weston. |
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Frogs and lily pads |
2000-01-23 |
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From Nick:
There are 5 lily pads and 4 frogs, 2 Red and 2 Green, how many moves does it take for them to swap sides?
Answer: 8 I have a formula which will tell you how many moves it will take with different total numbers of frogs, it is [(F*F)/4]+F Where F is the number of red frogs add the number of Green frogs. This formula only works with numbers of frogs that are the same on each side. What I would like to know is why this formula works and why you have to divide it by 4?
Answered by Penny Nom. |
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The limit of f(x)/x |
2000-01-22 |
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From Laurent Jullien:
I would appreciate help to prove that a twice continuously differentiable convex function from R+ to R has the property that f(x)/x has a limit when x tends to infinity.
Answered by Claude Tardif. |
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Domain of a function |
2000-01-19 |
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From Stacey Hutchison:
What is the domain of: f(x) = -1/(x + 4)
Answered by Patrick Maidorn. |
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Arclength of a circle |
2000-01-19 |
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From Holly:
What is the formoula for finding the arc length of a central angle of a circle??
Answered by Harley Weston. |
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Logarithms |
2000-01-18 |
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From Jennifer:
Hi I have a test tomorrow and I was wondering if you could help me with these two problems. Explain how to express y in terms of x if log3y=4log3(2X) The LN key on your scientific calculator is not working, but the ex and LOG keys are. Write directions for calculating a natural logarithm using the ex and LOG keys. Explain why these directions will get you the right answer.
Answered by Harley Weston. |
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Pyramids and prisms |
2000-01-18 |
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From Tyler:
What's the definition of a Triangular Prism and a Triangular pyramid.
Answered by Penny Nom. |
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Algebra |
2000-01-18 |
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From Candis:
I want to know what exactly is Algebra?
Not how to do it, or methods. Just what is it?
Answered by Allen Herman. |
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Ax + By = C |
2000-01-18 |
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From Fatiha Khanboubi:
I was wondering if you could please explain to me how I would write the equation of line through the given points [(4,1), (6,3)] in Ax+By=C form.
Answered by Harley Weston. |
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Solving an equation |
2000-01-17 |
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From Shelley's Mom:
My daughter has an assignment in math that includes this equation: -6b+5= -10 I've tried to help her with a scale. We've figured that you subtract 5 from each equation so its not -6b = -15. Is this correct and can you help us figure out the next step?
Answered by Penny Nom. |
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An unbelievable story |
2000-01-17 |
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From Melissa:
good morning-i am taking a course "math for elementary teachers" and i have a take home problem that i really need help on. here is the question
-the million dollar problem
a recent item in the newspaper described a robbery in which the robber had held up a local bank for 1 million dollars in small bills, had the tellers put the money in a briefcase which he gave them, and fled the scene on foot. is this story believable? explain your answer!
Answered by Harley Weston. |
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Taxicab geometry |
2000-01-16 |
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From Jack:
Im doing an investigation entitled 'taxicab geometry', ive attempted it and have done most of the practical part of it. But i cant seem to see the equation behind it all. please guide me in the right direction. They provide a regular grid with regular horizontal and vertical lines. The lines are roads and the actual squares are blocks of hoouses/ buildings. In taxicab geometry the distance between place A & B is worked out by adding together the horizontal and vertical distances. each square is counted as i unit. Part 1 (I've done this) A taxix cab firm is based at A. the posistion B is 7 units away from A. investigate all the posistions of B at 7 units. investigate for different distances. .
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Answered by Penny Nom. |
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Order of operations |
2000-01-16 |
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From Dorothy:
I was wondering if you could tell me where I can get some info. on how to solve the following problem. I was given the answer but I don't know how it is solved. 4+2x(6x2)-5=23
Answered by Penny Nom. |
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A roll of paper |
2000-01-15 |
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From Richard:
I have a roll of paper, wrapped around a corrugate core, whos diameter is 10.750 in. The outer diameter of the roll is approx. 60 in. The thickness of the paper is .014 in. I am trying to find out how much linear feet of paper is left on the roll, given only the diameter of paper remaining on the core.
Answered by Chris Fisher and Harley Weston. |
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