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Extraneous solutions |
2009-06-02 |
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From Ayana:
solve and check for extraneous solutions.
3x+6/ x²-4 = x+1/ x-2
x can not = {-2,2}
Answered by Penny Nom. |
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Selecting 3 people from 4 |
2009-06-02 |
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From muhammadibeaheem:
Use mathematical induction to prove that for all integers n≥1,
is divisible by 3.
Question 2;
A club consists of four members.How many sample points are in the sample space when three officers; president, secretary and treasurer, are to be chosen?
Answered by Penny Nom. |
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Stones around a pool |
2009-06-01 |
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From Jessica:
I am putting a yard pond in and I am trying to find out how many stones I would need for the perimeter.
The pond is 4ft (W) by ft (L) by 1.5ft (D)
Thank You,
Jessica
Answered by Penny Nom. |
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Conditional probability |
2009-06-01 |
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From Tanja:
A biased coin where P(heads) =3/5 is flipped 4 times. What is the probability of getting at least 3 heads given at least 1 heads is flipped?
I can calculate this using P(A|B) =P(AandB)/P(B) but I've had students asking me how you would work this question out the "long way"
without the formula. I'm am unsure about how you do this the long way.
Answered by Robert Dawson. |
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Two equations |
2009-05-31 |
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From tony:
y = 1.2x - 32.7,
y = -0.7x + 46.15
can you please solve this for me? i am not able to figure it out... thank you
tony
Answered by Penny Nom. |
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how do I factor 45 - 5x^2 |
2009-05-31 |
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From tracey:
how do I factor 45 - 5x^2
Answered by Penny Nom. |
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The dimensions of a rectangle |
2009-05-30 |
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From Linda:
A rectangle has a perimeter of 38 feet & an area of 48 square feet. What are the dimensions of the rectangle?
Answered by Stephen La Rocque. |
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sin x/ 1+cos x = 1-cos x/ sin x |
2009-05-30 |
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From rita:
prove: sin x/ 1+cos x = 1-cos x/ sin x
Answered by Stephen La Rocque. |
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How much more volume is needed to reach a certain % |
2009-05-29 |
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From Chris:
I am trying to figure out how much more volume is needed to reach a certain %. For example if I sell 15,182 of unit X out of 43,241 total units. Then I know that unit X is 35.1% of units sold. However, I need to get unit X to be 46.3% of total units sold. I need to figure how many more units of X I need to sell to reach this %. Of course if I sell more units of X then this increases the denominator. Can you please help? Thank you for your time.
Answered by Penny Nom. |
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Draw a net for a rectangular prism? |
2009-05-29 |
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From Mohamad:
Draw a net for a rectangular prism?
Last week when we were studying for our finals we came across a section about drawing nets I would really appreciate it if you gave me some help on it
Answered by Robert Dawson. |
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A border around a pool |
2009-05-29 |
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From PATTY:
POOL RADIUS IS 13 FEET ON THE OUTER EDGE, I WANT TO MAKE AN 18 INCH OUTSIDE BORDER AROUND THE POOL. WHAT IS THE VOLUME AROUND THE POOL. (THIS IS GOING FROM A 13 FT. RADIUS TO A 14.5 RADISU.
Answered by Penny Nom. |
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Solve 18(C-3)=162 for C |
2009-05-29 |
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From Alicia:
18(C-3)=162
adult student returning to school after 20 years and
then never had it in school. Just doesn't click yet
Answered by Penny Nom. |
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4.6 quadrillion divided by 65,000,000 |
2009-05-28 |
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From david:
4.6 quadrillion divided by 65,000,000
Answered by Penny Nom. |
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How many times does the graph of y=2xsquared -2x + 3 intersect the x-axis? |
2009-05-27 |
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From Henry:
how many times does the graph of y=2xsquared -2x + 3 intersect the x-axis?
Answered by Penny Nom. |
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Two ships and a lighthouse |
2009-05-27 |
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From Chelsey:
I have a question in regards to how do I know when to use tangent or cosine when determining angles. The question is: Looking north from the observation deck of a lighthouse 60 m above the sea, a lighthouse keeper sees two ships. The angles of depression to the ships is 5 degrees and 10 degrees. How far apart are the ships?
I don't understand which one to use when solving the equation.
Answered by Harley Weston. |
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