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Multiplying fractions |
2000-05-14 |
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From A student:
75/2 x 1/100 = 3/8 Please show how to came up with the answer?
Answered by Penny Nom. |
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A matrix equation |
2000-05-14 |
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From A student:
Right now, we are dealing with matrices and we are supposed to solve the following problem on our graphing-calculators: 2a+3b-4c+d=20
a-2b+3c-5d=-14
3a+4b-2c+3d=19
5a-b+6c+4d=-5
Answered by Penny Nom. |
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Subtracting polynomials |
2000-05-13 |
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From Teresa:
I am suppose to subtract the lower polynomial from the one above it. -3a+11b+2f
-3a- 6b+8f
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Answered by Penny Nom. |
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4x - [2x -(3x - 2)] = 13 |
2000-05-13 |
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From Teresa:
I need to find the following equation.
4x - [2x -(3x - 2)] = 13
Answered by Penny Nom. |
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Reflection off a sphere |
2000-05-12 |
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From Mark Adami:
Given two points P,E and a sphere. Find a point on the sphere, T, so that a line from P that bounces off the sphere at T goes through point E.
Answered by Chris Fisher and Harley Weston. |
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Solve 2sin 3x-1=0 |
2000-05-11 |
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From Cynthia:
How would you solve 2sin 3x-1=0? I don't know what to do with the 3.
Answered by Penny Nom. |
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The units digit of 3 to the 58th power |
2000-05-10 |
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From Kylie Mcalpine:
the questions we have been asked are what is the units digit of the following: a) 358
b) 2358
c) 1731 and the harder question of: what is the units digit of the following sum: 13841 + 17508 + 24617 = ???????
Answered by Paul Betts and Penny Nom. |
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Odds and combinations |
2000-05-10 |
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From Lucy:
If the odds are 1/15 of winning, what is the probability? if c 5! 3! How does it equal 10?
Answered by Harley Weston. |
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The Village of Truth |
2000-05-10 |
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From Sean Pearson:
Our teacher gave us a logic problem involving two villages: the village of truth, and the village of lies. The problem is in asking two guards the right question to gain entrance to the fenced compound the villages are in without being shot. Have you heard of this problem ?
Answered by Harley Weston. |
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Trig functions |
2000-05-09 |
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From Melissa:
Find all solutions in the interval (0,2pi)
2cos2x-3cosx-4=0
Answered by Paul Betts and Harley Weston. |
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Supplementary angles |
2000-05-09 |
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From Suzanne:
We know that: Supplementary angles are two angles whose sum equals 180 degrees and complementary angles are two angles whose sum equals 90 degrees. Are supplementary and complementary angles necessarily adjacent? or can they be non-adjacent?
Answered by Chris Fisher. |
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Looking for a pattern |
2000-05-08 |
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From Laura:
Yesterday, me teacher stumped me with a question. He talked to us about square units. He told us an area of 1 square unit produces 1 shape, an area of 2 sq.units produces 1 shape, an area of 3 sq.units produces 2 different shapes, an area of four square units produces 5 different shapes, and an area od five sq.units produces 12 different shapes. He left us there. He said we had to find how many different shapes an area of 1 sq. unit produces through how many different shapes an area of 15 sq.units produces. He said we could complete this "chart" by finding an equation. But, I can't find the equation. I think it may be a quadratic of some sort. My teacher told us to use the area(in sq.units) as X and the # of different shapes produced as Y. Now, what really is stumping me is I would have to have an equation so when X is Y, Y is 1 and when X is 2, Y is 1. I have also tried to see if I can complete a patter or something. The pattern I saw was 1,1,2,5,12. I can't make much sense of that pattern.
Answered by Penny Nom. |
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Parallel and perpendicular lines |
2000-05-08 |
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From Jimmy Lumpkins:
Need a method for solving the following problem: Find the equation of a line through point P that is parallel or perpendicular to another line.
Answered by Paul Betts. |
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Related Rates |
2000-05-07 |
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From Derek:
How can you show that if the volume of a balloon is decreasing at a rate proportional to its surface area, the radius of the balloon is shrinking at a constant rate.
Answered by Harley Weston. |
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Probability and odds |
2000-05-05 |
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From Leah:
The chances of rain on friday, saturday, and sunday are 20%, 30%, and 50% respectively. what are the odds it will rain all three days?
Answered by Harley Weston. |
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