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2=the square root of (2 + the square root of (2 + the square root of (2 +...))) |
2001-11-05 |
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From Cynthia:
justify algebreically, that: 2=the square root of 2 + the square root of 2 + the square root of 2 + the square root of 2 + the square root of 2 + and so on, .......
Answered by Penny Nom. |
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Squares of negative numbers |
2001-11-03 |
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From Susana:
I wanted to know if I can square a negative number..?
Answered by Leeanne Boehm. |
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Applied geometry |
2001-11-02 |
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From Jenny:
Where can I find some hands-on activities for my Applied Geometry classes? I want to do more activities with them that allow us to get out of the classroom. However, I want to use activities that use only inexpensive equipment because I usually buy the equipment myself.
Answered by Walter Whiteley. |
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A lighthouse problem |
2001-11-02 |
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From A student:
A lighthouse at apoint P is 3 miles offshore from the nearest point O of a straight beach. A store is located 5 miles down the beach from O. The lighthouse keeper can row at 4 mph and walk at 3.25 mph.
a)How far doen the beach from O should the lighthouse keeper land in order to minimize the time from the lighthouse to the store?
b)What is the minimum rowing speed the makes it faster to row all the way?
Answered by Harley Weston. |
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15 % of 24.95 |
2001-11-01 |
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From Puzzled:
How do I take 15% of a number I have forgotten
Answered by Penny Nom. |
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8w-15 = 3w-10 |
2001-11-01 |
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From A student:
8w-15=3w-10, w =?????
Answered by Paul Betts. |
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Division by zero |
2001-10-31 |
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From Stacy:
I have a question about dividing with zero. When the numerator is zero, the answer is zero. But when the denominator is zero, the answer is undefined. Why? I don't understand
Answered by Claude Tardif. |
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(-3)to the power 2, divided by 3 |
2001-10-31 |
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From Raz:
what is (-3)to the power 2, divided by 3=
Answered by Penny Nom. |
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m - 8 |
2001-10-30 |
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From Danita:
Can you please e-mail me the answer to m -8 for m = 20 and how you got the answer
Answered by Penny Nom. |
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3pi/2 - pi |
2001-10-29 |
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From Karen:
I need to simplify this a) 3pi/2 - pi
Answered by Penny Nom. |
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A sample size problem |
2001-10-28 |
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From Charles:
The U.S Transportation Dept. will randomly sample traffic reports to estimate the proportion of accidents involving people over the age of 70. The Dept. has no advance estimate of this proportion. how many reports should the dept select to be atleast 97% confident that the estimate is within .01 of the true proportion?
Answered by Harley Weston. |
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Three problems |
2001-10-28 |
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From Brenda:
- Joseph is planting bushes around the perimeter of his lawn. If the bushes must be planted 4 feet apart and Joseph's lawn is 64 feet wide and 124 feet long, how many bushes will Joseph need to purchase?
- The cost of a long distance phone call is $1.50 for the first two minutes and $0.60 for each additional minute. How much will Maria pay for a 24 minute phone call?
- Find the next three numbers in the pattern. 1,3,7,15,31,___,____,___.
Answered by Penny Nom. |
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Is the tree a pine tree? |
2001-10-27 |
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From Kate:
Suppose Stock Brokers tell the truth 2/5 of the time, and 1/3 of the trees in a given forest are Pine. If 4 Stock Brokers say that a certain tree in that forest is Pine, what is the probability that the tree is indeed a Pine tree?
Answered by Penny Nom. |
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Negative times negative is positive |
2001-10-26 |
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From Mary:
I have a question about adding and multiplying positive and negative numbers. When we add two negative numbers the answer is negative BUT when we multiply two negative numbers the answer is positive. I don't understand. Why?
Answered by Penny Nom. |
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Why do you flip the inequality sign? |
2001-10-26 |
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From Sean:
I have a question about an inequality problem. Here it is: Solve and graph 5 - 3x => 17. (=> is greater than or equal). Please tell me why you flip the inequality sign when divinding by a negative number.
Answered by Penny Nom. |
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