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lev888
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lev888
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01-16-2018
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07:42 AM
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11-08-2018,
04:07 PM
lev888
replied to a thread
Strange Calculus assignment - Related Rates? "Meredith goes on a hike..."
in
Calculus
Yes, I agree with 4 < t < 5 1/3 hr. I mentioned the all level case to point out that there are multiple solutions.
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13 replies | 589 view(s)
11-08-2018,
10:36 AM
lev888
replied to a thread
Strange Calculus assignment - Related Rates? "Meredith goes on a hike..."
in
Calculus
Why can we assume that? If the whole trail is level it would take 4 hours there and 4 back. Seems like a valid solution. If it's 100% uphill there...
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13 replies | 589 view(s)
11-07-2018,
06:02 PM
lev888
replied to a thread
Strange Calculus assignment - Related Rates? "Meredith goes on a hike..."
in
Calculus
Yes, 48km. Haven't figured out the other question.
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13 replies | 589 view(s)
11-07-2018,
04:41 PM
lev888
replied to a thread
Strange Calculus assignment - Related Rates? "Meredith goes on a hike..."
in
Calculus
I would start with "rearranging" the trail to simplify things: divide it into 3 parts: 1. all downhill segments, 2. all level, 3. all uphill. Then...
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13 replies | 589 view(s)
11-07-2018,
11:57 AM
lev888
replied to a thread
I don't get this? "In August 2013, there were more than 119,000 people on wait list"
in
Pre-Algebra
The sum of people waiting for a kidney or a liver was 113,162. There were 81,528 fewer people waiting for a liver than for a kidney. Looks like a...
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5 replies | 369 view(s)
11-02-2018,
03:19 PM
lev888
replied to a thread
Arithmetic sequence: We throw an object from the hight of 12,261 meters.
in
Intermediate/Advanced Algebra
This is not an arithmetic problem. Look up motion formulas - i.e. distance traveled as a function of time, initial speed and acceleration.
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8 replies | 267 view(s)
10-31-2018,
11:20 AM
lev888
replied to a thread
If 67% is worth £100, What is 20% worth
in
Arithmetic
I think this would be a good start: https://www.freemathhelp.com/forum/threads/112086-Guidelines-Summary?p=436773#post436773
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4 replies | 284 view(s)
10-23-2018,
02:56 PM
lev888
replied to a thread
Percent & Discounts: confused by the "... rug of equal value...".
in
Finance/Business Math
If I offer you a $100 item with a 50% discount, then another 50% discount, what is the final price?
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8 replies | 563 view(s)
10-23-2018,
08:38 AM
lev888
replied to a thread
I don’t really know where to put this under please help: 6.25 -38 = 7-33.93
in
Pre-Algebra
Ratios? Do you mean 6.25/38 = 7/33.93? Doesn't look right to me. Please verify and post your work.
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3 replies | 287 view(s)
10-22-2018,
03:34 PM
lev888
replied to a thread
Struggling: eed to know the total xp required to reach 1000
in
Intermediate/Advanced Algebra
Does this look right? 2*250 + 3*250 + ... + 1001*250 = (2 + 3 + ... + 1001)*250 = Can you continue? (I am not sure whether the last component in...
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4 replies | 466 view(s)
10-19-2018,
03:54 PM
lev888
replied to a thread
Unusual Inequality Proof
in
Intermediate/Advanced Algebra
Ok, p_0 q_1 < p_1 q_0 . Now do the same thing with the first inequality that you need to prove.
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4 replies | 205 view(s)
10-19-2018,
12:55 AM
lev888
replied to a thread
Unusual Inequality Proof
in
Intermediate/Advanced Algebra
Multiply both sides of each inequality by one denominator, then the other.
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4 replies | 205 view(s)
10-18-2018,
11:23 AM
lev888
replied to a thread
semi circle problem: square inside has area 36 cm^2; find radius of semi-circle
in
Geometry and Trig
It's correct, but unnecessarily complex. I used the pythagorean theorem approach mentioned above.
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11 replies | 388 view(s)
10-18-2018,
10:28 AM
lev888
replied to a thread
semi circle problem: square inside has area 36 cm^2; find radius of semi-circle
in
Geometry and Trig
Could you show your solution?
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11 replies | 388 view(s)
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About lev888
Location:
Boston
Interests:
Photography, puzzles, reading
Occupation:
Software Development
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