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Vitamins A and B |
2001-01-14 |
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From Sara:
A diet is to include at least 140 mg of Vitamin A and at least 145 mg of vitamin B. these requirements are to be obtained from two types of food. type X contains 10 mg of vitamin A and 20 mg of vitamin B per pound. Type Y contains 30 mg of vitamin A and 15 mg of vitamin B per pound. if type X food costs $12 and Type Y $8 per pound, how many pounds of each type of food should be purchased to satisfy the requirements at the minimum cost?
Answered by Claude Tardif and Harley Weston. |
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Compression by a factor of ? |
2001-01-12 |
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From Wayne:
Given an equation like y = (1/2) (x-3)2 + 6, when describing the distortion from the base curve y = x2 is it correct to say there is a vertical compression by a factor of 2, or by a factor of 1/2 ? Which is more correct? I have seen both versions in different high school texts, and I am now unsure which is more correct.
Answered by Harley Weston. |
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Completing the square |
2001-01-12 |
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From Jacky Lam:
A friend told me that completing square not only can find the vertex but also the roots of a quadratic equation. Is it possible? How? Can you show me how to find the roots of the following equation using completing the square? 8x2 + 8x + 4
Answered by Penny Nom. |
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64.5% profit |
2001-01-12 |
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From Ethel:
IF I PURCHASE AN ITEM FOR $2.00 AND I WANT TO RESELL IT WITH A MARGIN OF GROSS PROFIT OF 64.5% WHAT FORMULA DO I USE TO ARRIVE AT THAT RESELL FIGURE?
Answered by Penny Nom. |
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Blood flow and age |
2001-01-11 |
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From Gayle:
I don't understand the second part of this problem Here is the first part that was correct. A 35yr old has 100% blood flow. A 65yr old has 64% blood flow. Find the rate of change per yr in the percent of blood flow. (This part is correct) m=(64-100)/(35-65)= -36/30= -1.2 per year of blood flow. Now, here is the second part I DON'T UNDERSTAND! .Let b represent the percent of blood flow and a represent a person's age. Write an equation that you could use to predict the percent of blood flow for a person of any age over 35.
Answered by Penny Nom. |
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Place value chart |
2001-01-11 |
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From Charles:
Can you send me a pictorial example of a place value chart?
Answered by Harley Weston. |
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8, 4, 2, 18, 1, 9 |
2001-01-11 |
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From Neyra:
Place each number below in one of the blanks to create the most meaningful and realistic story possible.
Answered by Claude Tardif. |
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A 1 from 35 lottery |
2001-01-11 |
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From Jamie:
A number is randomly drawn from an urn containing 35 balls numbered 00 to 34. How to win Division 1 Match the number drawn
Division 2 Match the last digit of the number drawn Calculation of probabilities for this lottery:...
Answered by Claude Tardif and Penny Nom. |
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x^5 + y^5 + z^5 = w^5 |
2001-01-11 |
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From Samuel Brown:
x5 + y5 + z5 = w5 I have no idea whether or not this is possible.
Answered by Claude Tardif. |
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The sum of all ten-digit numbers. |
2001-01-10 |
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From John:
Compute the sum of all ten-digit numbers. Can you determine the sum of all n -digit numbers?
Answered by Sukanta Pati. |
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Is n^2 - 2 a multiple of n - 4? |
2001-01-10 |
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From John:
Find all positive integers n so that n2 - 2 is a multiple of n - 4.
Answered by Sukanta Pati. |
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Four crayons |
2001-01-10 |
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From Neyra Espinoza:
You have four crayons (red, blue, yellow, green). If you line them up, how many different combinations can you get?
Answered by Patrick Maidorn. |
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The Pythagorean Theorem |
2001-01-08 |
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From Megan:
Why the Pythagorean Theorem so important in our lives and what is it's history?
Answered by Penny Nom. |
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Multiplication of fractions |
2001-01-08 |
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From Angela:
Questions:
1. represent multiplication of fractions via an area model 2. describe why, not just how, to round decimals
Answered by Penny Nom. |
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cot(arcsin 3/5) |
2001-01-07 |
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From Jason:
Find value. Assume that all angles are in Quadrant 1. cot(arcsin 3/5)
Answered by Harley Weston. |
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