alphaville
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Questions Asked

alphaville:
Group Title
The rim of the London Eye (a 135m diameter ferris wheel) moves 26 cm/sec, slow enough for passengers to safely get on the wheel from the pla…
 updated 2 years ago
 7 replies
 No Medals Yet
Mathematics

alphaville:
Group Title
I'm trying to find the approximate percentile rank of a lightbulb that failed at
9000 hours (based on the information from the problem below…
 updated 2 years ago
 No Medals Yet
Mathematics

alphaville:
Group Title
The amount of a monthly electric bill (B, measured in $) depends
on the amount of electricity used that month (E, measured in
kWh). A typi…
 updated 2 years ago
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Mathematics

alphaville:
Group Title
Calculus Problem? Could someone explain how to find the months when the max/min occur for this?
The National Oceanic and Atmospheric Admin…
 updated 2 years ago
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Mathematics

alphaville:
Group Title
Could someone interpret the following formula modelling carbon dioxide
H(t) = 0.013t^2 + 0.81t + 316 + 3.5 sin 2πt, where t = 0 represents…
 updated 2 years ago
 1 reply
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Mathematics

alphaville:
Group Title
A mass attached to a spring will hang at an equilibrium point.
If it is then pulled away and either given a shove or simply let go,
its di…
 updated 2 years ago
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Mathematics

alphaville:
Group Title
Could someone explain what each part of this formula represents?
y = 0.058t^2 + 0.41t + 516 + 2.5 sin(2π)(t)
 updated 2 years ago
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Mathematics

alphaville:
Group Title
...........
 updated 2 years ago
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Mathematics

alphaville:
Group Title
Could someone explain how to graph the following problem? I don't quite understand what
"Graph H for 0 ≤ t ≤ 3 and 300 ≤ H ≤ 340" is asking…
 updated 2 years ago
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Mathematics

alphaville:
Group Title
Could someone explain how to take the arcsin of both sides (inverse sine) for step #3 of this problem (in order to solve for t?
10 = 12 + 2.…
 updated 2 years ago
 4 replies
 1 Medal
Mathematics

alphaville:
Group Title
Trig problem  Could someone show me the steps for solving for t?
720 = 11.895+2.545sin [(2pi/366)(t80.5)]
 updated 2 years ago
 16 replies
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Mathematics

alphaville:
Group Title
How would I solve for t?
720 = 11.895+2.545sin [2pi/366(t80.5)]
 updated 2 years ago
 1 reply
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Mathematics

alphaville:
Group Title
how can i easily find the right scale for a sine graph ?
 updated 2 years ago
 1 reply
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Mathematics

alphaville:
Group Title
I'm trying to create a formula modelling daylight hours in a particular city for a one year period using the form y=d+a sin[b(tc)]. Would y…
 updated 2 years ago
 No Medals Yet
Mathematics

alphaville:
Group Title
How should I round up the numbers I have for A and D? Or should I just leave them as they are? My math is a bit rusty...
(This is for a fo…
 updated 2 years ago
 2 replies
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Mathematics

alphaville:
Group Title
I need to create a sine graph of the daylight hours for a particular city/year based on a set of data obtained from the US Naval Observatory…
 updated 2 years ago
 1 reply
 No Medals Yet
Mathematics

alphaville:
Group Title
Statistics problem  How would I find the timetofailure of a lightbulb with a zscore of 1.25?
 updated 2 years ago
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Mathematics

alphaville:
Group Title
How do I determine when a growth rate starts to decline on a linear and exponential graph...when the lines start to get closer?
 updated 2 years ago
 1 reply
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Mathematics

alphaville:
Group Title
How do I determine the appropriate scale for making a graph?
for instance: y= 14,000,000+160,000?
 updated 2 years ago
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Mathematics

alphaville:
Group Title
If I wanted to create a formula to show an additional increase to something, would I use exponential or linear form?
For example: A town…
 updated 2 years ago
 2 replies
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Mathematics

alphaville:
Group Title
How would I create a formula for the following problem if the food supply growth rate has doubled? The food supply is represented in million…
 updated 2 years ago
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Mathematics

alphaville:
Group Title
How would I solve for for x? My math is totally rusty:
160,000 = x / 100 * 12,000,000
 updated 2 years ago
 4 replies
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Mathematics

alphaville:
Group Title
I need to create a formula that represents if the food supply growth rate doubled using the following numbers

…
 updated 2 years ago
 2 replies
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Mathematics

alphaville:
Group Title
I have a question about making formulas for calculating supply rates... Would I add one amount to the rate of increase if the formula is in…
 updated 2 years ago
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Mathematics

alphaville:
Group Title
How would I find a formula for the following problem if the town increases their current food supply to feed an additional 2 million people …
 updated 2 years ago
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Mathematics

alphaville:
Group Title
How would I find the formula for the following problem if the food supply growth rate doubled? (using linear or exponential form)
A town cu…
 updated 2 years ago
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Mathematics

alphaville:
Group Title
How would I find the formula for the following problem that shows if the town managed to double its food supply growth rates (using linear …
 updated 2 years ago
 1 reply
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Mathematics

alphaville:
Group Title
How would I find the formula for the following problem that shows if the town managed to double its food supply rates (using linear or expo…
 updated 2 years ago
 No Medals Yet
Mathematics

alphaville:
Group Title
A town currently produces enough food to feed 12 million people, and is increasing its food
supply to feed an additional 160,000 people per …
 updated 2 years ago
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Mathematics

alphaville:
Group Title
Find the time required for the remaining amount to reach half its initial level. I don't understand how to to solve this step to get t = 13.…
 updated 2 years ago
 5 replies
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Mathematics
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