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100% on two tests |
2000-02-01 |
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From Craig and Chelsea Bruzzone:
A class of 35 students took a math test and a science test. 12 students got 100% on the math test. 9 students got 100% on the science test. There were 19 students who made less than 100% on both tests. How many students made 100% on both tests?
Answered by Penny Nom. |
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Mark's life |
2000-01-30 |
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From Jean and Larry Brandemuehl:
Mark passed 1/6 of his life in childhood, 1/12 in youth, and 1/7 more as a bachelor. Five years after his marriage, there was born a son who died four years before his father, at half his father's (final) age. How old was Mark when he died?
Answered by Penny Nom. |
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Percent of improvement |
2000-01-30 |
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From Steve Quigg:
In a 1998 survey, 21% polled responded favorably to a question. In 1999, 31% responded favorably. What is the percent of improvement?
Answered by Harley Weston. |
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Can't make an equation! |
2000-01-30 |
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From Maggie Clarke:
An estate is to be distributed among the wife, 3 children and 2 grandchildren. The children will each receive 2x as much as each grandchild, and the wife will receive 4x as much as each child. If the estate amounted to $115,000, how much will each person receive?
Answered by Penny Nom. |
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Names of the polygons |
2000-01-29 |
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From Janemath:
I have been doing research on the names of polygons with 11 to 20 sides. I have found conflicting names for some of them . for example 18 sided-octadecagon and octokaidecagon. 11sided-undecagon and hendecagon. Why is this? Is one more correct than another? Or are they equally acceptable?
Answered by Harley Weston. |
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Two problems |
2000-01-29 |
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From D. J. Anthony:
Hi, I am taking a course "math for elementary teachers" and I have two problems. - How thick is a sheet of paper in your textbook.
- A little island has a population of 1,000 people. It doubles every 30 years. What will the population be in 30 years?, in 60 years?, when will it be over one million?
Answered by Peny Nom and Claude Tardif. |
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Compatible numbers |
2000-01-27 |
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From Angie:
Use compatible numbers to estimate each product and quotient.
23*1/2
1/3*11
Answered by Penny Nom. |
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Factors |
2000-01-27 |
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From Pam:
My son [age 9, 4th grade] has a math problem with factors. I need to know how to do the problem that involves the factor 24. I'm not even sure where to start.
Answered by Harley Weston. |
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Probability, graph theory and VLSI testing |
2000-01-27 |
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From Valentin Muresan:
I am postgraduate student of Dublin City University, Ireland, in the field of VLSI Testing. I am currently working on some heuristics and I need a probability formula. I want to get an expert's point of view in my matter. Say there is an initial list of so called tests: T1, T2, T3, ..., Tn Every test element Ti of the above list has a list of compatibility (incompatibility), which includes all the elements (tests) from the initial list, the Ti test is compatible (incompatible) with. For example, say the initial list is: {T1, T2, T3, T4, T5, T6, T7, T8, T9, T10} and the compatibility lists of these elements (tests) are:
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Answered by Denis Hanson. |
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Quadratics |
2000-01-27 |
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From Lori:
Hi my name is Lori. I'm a student, in the 11th grade.I have a problem in quadratic functions. I don't know how to get the numbers into the problem and then how to do the problem. here is one problem the rest are sort of similar to it... y=2x squared. If I were to find out how to get the (x,y) answers then I could graph it but as I said I can't find the numbers to go into the problem. Also in the equation g: x arrow to y = -x + 4..... how would you know weather it is or isn't a quadratic equation????
Answered by Penny Nom. |
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Counting guppies |
2000-01-26 |
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From Sarah Albaugh:
Out of 200 fish, 99% are guppies. How many guppies must be removed to have 98% of the remaining fish to be guppies?
Answered by Penny Nom. |
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Quadratic |
2000-01-26 |
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From Karen Johnson:
What is the reasoning behind the title quadratic equation?
Answered by Penny Nom. |
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Mixing oil and gas |
2000-01-25 |
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From Karen:
My hubby is ready to use his snow blower and is supposed to use 50:1 measurement....50 parts gas to 1 part oil......how does he do this if he has 1 gallon of gas? How much oil do we use...need info asap.....hopefully you are there!
Answered by Harley Weston. |
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Complex Roots |
2000-01-24 |
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From Jess Rutherford:
How do I find the value of k when 5x2 + k = 3x and has complex roots ?
Answered by Penny Nom. |
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Euclidean Math puzzle |
2000-01-24 |
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From Margaret Matthews:
(Check out this web-site: Simeon's Triangle Puzzle ) I have tried to figure out how this could be, because everything I know about it tells me it can't be. However, I can't seem to make it NOT work. Two right angle triangles. They are each cut up into four identical pieces. In the first, all the pieces fit together so that there are NO empty spaces; in the second, presumed to be identical in size to the first, the pieces are slightly rearranged, and now, there IS a space in the triangle.
Answered by Patrick Maidorn and Claude Tardif. |
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