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LCM |
2005-12-12 |
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From Alex:
what is the LCM of 210 and 54 and the LCM of 42 and 126
Answered by Penny Nom. |
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The temperature in June |
2005-12-12 |
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From Farina:
Question: Hi, I was having problem doing this problem.
Question:
Suppose the temperature during June is normally distributed with the mean= 20 degrees C and standard deviation= 3033 deg. A i the event that temperature is between 21.11 deg C. B is the event that the temperature is over 25Ged C. Event C is the temperature is below freezing point. Find the following probabilities:
A) P(A)
b) P(B)
C) P(C)
D) P(C given B)
E) P(neither A nor B)
F) find the expected number of days in June when event B will occur.
I know how to find questions A-D
I am only having problem with question E and F. Can you please help me. Thank You.
Answered by Penny Nom. |
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2/n +4 = 10- 4/3n |
2005-12-11 |
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From Jennifer:
2/n +4 = 10- 4/3n
5(x-3/4) = x+1
Answered by Penny Nom. |
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Complete the array |
2005-12-11 |
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From Ginger:
Make the sum of these number add up to six.
Going across, down, corner to corner. Using the number 4, 2, 0 only.
Answered by Penny Nom. |
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The perimeter of a collection of squares |
2005-12-11 |
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From Catherine:
using 12 squares, make a number of patterns (squares joined). Find the perimeters. Find out how many points in the shape have four radiating lines i.e. are two lines intersecting. Write an equation to state the relationship between the lines and the perimeter.
Answered by Penny Nom. |
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A point is twice the distance from y = 5 + 2x as it is from y = 5 - 2x |
2005-12-09 |
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From Hazel:
A point moves so that its distance from the line y=5+2x is twice its distance from the line y=5-2x. Find the general form of the equation of its locus.
Answered by Penny Nom. |
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The number of combinations of the digits 0235588 |
2005-12-07 |
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From Blake:
If you have the digits 0235588 how many different combinations can you possibly form with these seven digits?
Answered by Penny. |
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Four tangent circles |
2005-12-06 |
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From Ananth:
I have one bigger circle A with radius 15.
Inside this bigger circle i have another circle B with radius 3 which touch this bigger circle. Have another circle C with radius 4 which touches A and B. I would like to draw a biggest circle which touches A,B and C.
Answered by Chris Fisher. |
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The stair problem |
2005-12-06 |
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From Arnold:
My daughter had me help her with some of her college math problems that require finding the pattern. The problem was the stair problem where you can climb either 1 step or 2 steps at a time. How many combinations are there to get to the 10th step. I found the data set that solves the answer to the question, but is there an equation that expresses the answer in terms of n?
1 2 3 4 5 6 7 8 9 10 stair number
1 2 3 5 8 13 21 34 55 89 number of possible combinations
Answered by Harley Weston. |
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A concrete patio |
2005-12-06 |
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From Anne:
If you are making a concrete patio 4 inches thick, what is the area of the largest patio you could make if you ordered 2 cubic yards of concrete?
Answered by Penny Nom. |
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how do you convert ml to oz? |
2005-12-05 |
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From Sara:
how do you convert ml to oz?
Answered by Penny Nom. |
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(5 + 10) x 2 - 10 = |
2005-12-05 |
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From Jessica:
(5 + 10) x 2 - 10 =
Answered by Penny Nom. |
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A sheet metal cone |
2005-12-05 |
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From Laura:
I am an art student and in the process of making a cone out of sheet metal. I am unable to work out the template I need to produce my final cone. The dimensions I have are that the final cone will be 58mm high and will have a diameter of 102mm.
Answered by Penny Nom. |
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A long distance call |
2005-12-05 |
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From A student:
The Small World long distance phone company charges 55cents for the first minute of a long distance call and 23cents for each additional minute.
1. How much would a 10- minute long-distance call cost?
2. If a call costs $4.55. how long did the call last?
3. Write an equation for the total cost, C, of an m-minute long-distance call.
Answered by Penny Nom. |
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A pair of trig equations |
2005-12-05 |
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From Kevin:
I am trying to solve for A and B but haven't been able to find a trig identity that will help me.
1.414 = .5cosA + cosB
.5 = .5sinA - sinB
how do I solve this?
Answered by Penny Nom. |
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