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Recent problems solved by 'themathtutor2009'
themathtutor2009 answered: 81 problems
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Matrices-and-determiminant/306604: Hi all, Im slightly confused with answering this question because I cant answer part b) with the matrix I get for part a). (See below)
The current of I1 and I2 are connected by the equations:
9.5(I1) - 8(I2) = 27
-8)I1 + 10(I2) = -26
a) Express this system of equations in Matrix form.
b) Solve the system of equations for the currents I1 and I2 using the inverse matrix.
You cant solve for the inverese of an non-square matrix, so how do I solve for I1 and I2?
Any help would be great.
1 solutions
Answer 219387 by themathtutor2009(81)   on 2010-05-19 21:28:22 (Show Source):
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Money_Word_Problems/306024: If a bank pays 4.4% interest compounded continuously, how long does it take to triple the original amount?
Here's what I tried:
y = a(1 + r)^t
3a = a(1 = 4.4) ^ t.
I solved for t by first dividing by a, then using the property of equality for logarithms and came up with .65142 but I don't understand the answer. If t represents the time period, what is it? 65% of one year??
Or did I work it wrong?
Thank you!
1 solutions
Answer 219070 by themathtutor2009(81) on 2010-05-18 18:42:30 (Show Source):
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Problems-with-consecutive-odd-even-integers/305980: Hi, I'm a high school senior and need help solving a True Equation problem. I must use 0-9 to make the equation and must use each digit once.
Here is the problem (There are four problems in one question);
2+_=_
_x_=__(This one needs a double digit, i.e 22 or something)
_/_=2
_-1=_
I must use the numbers only once. I do not believe that the 2 and 1 count against the 0-9 numbers. So far I thought that this would work;
4/2=2 but now I got stuck on the rest. Originally the whole problem read;
2+6=8
5x7=12
4/2=2
_-1=_
But I don't think that works. Can you help me please?
1 solutions
Answer 219059 by themathtutor2009(81) on 2010-05-18 18:27:34 (Show Source):
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Miscellaneous_Word_Problems/306010: Please find a counterexample to the statement: The square of a number added to the sum of twice the number and 8 is a prime number. Justify your solution by supporting it with step by step work.
Thank you very much
1 solutions
Answer 219052 by themathtutor2009(81) on 2010-05-18 18:13:19 (Show Source):
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Quadratic_Equations/305971: the melting point of subtance x is -20 degrees celsius and the boiling point is 90degrees celsius. how many celsius degrees are there between the melting point nd the boiling point?
1 solutions
Answer 219026 by themathtutor2009(81) on 2010-05-18 16:47:12 (Show Source):
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