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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year ago
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Mathematics

alphaville:
Group Title
...........
 updated one year 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 one year 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 one year 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 one year 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 one year ago
 1 reply
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Mathematics

alphaville:
Group Title
how can i easily find the right scale for a sine graph ?
 updated one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year 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 one year ago
 5 replies
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Mathematics
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