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Two word problems |
2009-07-31 |
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Lee pose la question : 1) a student saved $50.25 in one month. at that rate how long will it take
the student to save $700?
2) for summer job, martin shampooed rugs. he could finish a 4mx 4m rug in 30 min.
his supervisor could finish a similar:smaller rug in 20 min. how long would
it take for them to finish the rug if they worked together? Robert Dawson lui répond. |
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sinA-cosA=1 |
2009-07-30 |
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Nazrul pose la question : How can I solve sinA-cosA=1 where 0 degree<=A<=90 degree. Thank you. Harley Weston lui répond. |
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Two equations in two unknowns |
2009-07-30 |
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Alicia pose la question : I need help with the following equation please show me the steps to complete so that I will know how to do this my self.
2x-y=2 5x+y=5 Thanks for the help Penny Nom lui répond. |
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A pentagon inscribed in a circle |
2009-07-29 |
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Faisal pose la question : O is the center of the circle. Sides AB and AE are equal. Angle B = 95,
angle C = 130, angle D = 138. Find angles A and E.
Diagram is attached.
Best,
Faisal Chris Fisher lui répond. |
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Dimensions |
2009-07-29 |
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Deborah pose la question : The blueprint for landscaping a yard has a scale of 1/2" to 1 foot. If the blueprint is a rectangle 18 inches by 22 inches, what are the dimensions of the yard? Robert Dawson lui répond. |
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Things equal to the same thing |
2009-07-29 |
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nazrul pose la question : If p^2-pa+q=0 and m^2-ma+n=0 , can we write p^2-pa+q= m^2-ma+n? Please explain. Robert Dawson lui répond. |
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Torricelli's trumpet |
2009-07-29 |
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Gary pose la question : I was reading about torricelli's trumpet which is described by the equation1/x which is then rotated around the x axis which results in a figure which looks like a trumpet. Now in order to find the volume the integral 1/x^2 dx is used which diverges when integrated so the volume is finite.However if you integrate 1/x dx which is the formula on the plane the answer diverges. Now if you took an infinite area then rotated it around the x axis shouldn't you get an infinite volume? Notice the area I am talking about is under the line 1/x not the surface area of the trumpet which is what the painters paradox is about What am I missing? Thanks Robert Dawson lui répond. |
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Highest Common Factor of Two Polynomials |
2009-07-28 |
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Nazrul pose la question : If x+a be the h.c.f. of x^2+px+q and x^2+mx+n, how can I prove that (p-m)a=q-n. Robert J. Dawson & Janice Cotcher lui répond. |
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Constructing an isosceles triangle |
2009-07-27 |
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Sanjay pose la question : How to construct an isosceles triangle ABC with a base BC = 5.4 centimetre and altitude AD = 4.7 centimetre? Please help. Janice Cotcher lui répond. |
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Intersection of Two Curves |
2009-07-27 |
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Amarah pose la question : Find the coordinates of the point A( this point is where the two lines intersect). Justify answer
question : here is a curve x^y =y^x (for x,y>o) Janice Cotcher lui répond. |
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How can I trisect an angle? |
2009-07-27 |
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Nazrul pose la question : How can I trisect an angle? Robert Dawson lui répond. |
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The inverse of F(x)=x^2-6x+13, for x>3 |
2009-07-26 |
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Juan pose la question : The function F is given by F(x)=x^2-6x+13, for x>3.
A. Write F(x) in the form (x-a)^2+b
B.Find the inverse function F^-1
C.State the domain of F^-1 Penny Nom lui répond. |
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Inequalities Proof |
2009-07-24 |
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ABOU pose la question : good morning.......a b c are real positive no zero......proof that
sq root(2a/(a+b))+sq root(2b/(b+c))+sq root(2c/(c+a))inferior or equal 3
thank you Janice Cotcher lui répond. |
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Properties of Natural Numbers |
2009-07-24 |
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nazrul pose la question : If m,n,k are natural number how can I prove that (m+n)k=mk+nk. In the proof the properties of natural number should be used. Janice Cotcher lui répond. |
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Finding the Common Difference and Number of Terms of an Arithmetic Sequence |
2009-07-24 |
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Juan pose la question : In an arithmetic sequence, the first term is -2, the fourth term is 16 and the nth
term is 11,998
A. What is the common difference?
B. What is the value of n. Janice Cotcher lui répond. |
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