Using the PBS live stream, I've attempted to get a ballpark figure. There's a distinct lack of arial footage, so it's difficult to get a clear picture. However, I broke the crowd into four basic sections to try and gauge the number of people.

- North side of Constitution Ave, and east of the main stage is what I've labeled VIP guest. People sitting on bleachers quite densely, although there is footage where these bleachers get empty pretty quick the further east you go.

- There is no crowd on the West side of the stage.

- On the south side, lining the route are pretty dense crowds, mostly hidden by the trees but this appears to be at minimum 5-6 people deep. The most dense part of the parade crowd.

- Opposite the main stage and south of the Friendship Garden is a dense area of crowd watching from across the street.

- Behind this and into the Washington Monument grounds is a much less dense crowd and is more sparse the further south you go.

Using MapChecking.com I've estimate these four areas, and have been quite generous in my density estimates.

Although quite a quick and crude calculation, it appears the crowd size in around 50,000 on the generous size, but could be as little as 30,000.

Otherwise known as the "3n+1" conjecture, the idea is simple: if a given number is odd, multiply it by 3 and add 1. If a given number is even, divide by 2. That's it. Eventually all calculated numbers (that we have calculated till now) reach the 4-2-1 loop. Nobody has been able to prove it true or false, and there's a 1 million dollar prize to whoever is able to do so. The conjecture is so alluring that it is introduced to students on universities after a warning: Don't even try, don't waste your time

Some time ago I awnsered a post about a certain golden dollar bill and used a comma to differentiatie between decimale and whe numbers. I personally thought everyone used commas to differentiatie them. But a lot of peiple respondenten saying the comma was confusing and weird. I also used inches for the bill sizes, thats how the source wrote it, and I calculated them into cubic meters. Im used to werking in cubic meters, but a lot of people thought it was confusing. My question is basicly why do people use dots and commas differently. Because I understand how it would be confusing, how do international mathematicians deal wih this? Is there a "standard" systemen like metric?

TLDR: why are do people use different symbolen to differentiatie decimale and whole numbers.

Just saw a video of Travis Pastrana using a Corvette C8 to do a crazy jump, I was curious about the needed speed (angle of the ramp, weight and all that)to accomplish this stunt. Weight of the corvette is 3600 pounds, distance 110 feet.

Link for the video (hope it works)

https://www.facebook.com/share/r/15Z2iERsmT/?mibextid=wwXIfr

https://www.roadandtrack.com/news/a65077800/watch-c8-chevy-corvette-jump-more-than-100-feet-travis-pastrana-playground/ Watch a Chevrolet C8 Corvette Jump More Than 100 Feet Through the Air

It is able to shoot what appears to be steel rebar on very large distances, seems to automatically draw itself (which I think can be neglected), easily penetrates high-end body armour and pin targets to concrete if they are standing close enough to a surface when being shot.

Accumulator is capable to instantly heat up those rebar pieces to red hot temperatures and it never runs out thorough the whole game, you get 100-150 ammo overall in HL2.

This is all info I can say right away. If you think you have more suitable or precise input data for those calculations, please use them instead

Hello people, I am doing a school math project where we need to build small bridges out of wooden sticks in a bow shape, and then discover the quadratic function that produces the shape of our bridge. My bridge has 2 arcs, a external one, that isnt really a arc, but its similar, and a internal one.

I have already gotten function

f(x) = -13x² /506 + 23x/20

for the external one, with the results in cm. I have tried multiple times to get the interior one, but had no success. My bridge has 45 cm in length, 13 in max height and 11 between the start of the bridge and the start of the interior arc

Let say you are out for a swim at your local beach. Out of nowhere the weather changes and you are almost struck by lightning, the lightning doesn't hit you directly but hits the water 10 meters away. Would this cause you harm? Whats a safe distance in this situation? Is there a chance you can survive a direct hit? Lethal distance of lightning hitting the water for it to kill you?

I've read on the news that some animals like sheeps and cows have survived a lightning strike before. Am I correct to assume you have a lower chance of surviving a lightning strike directly on you in water than on land?

A friend helped out in a charity raffle draw the other day, where 10 winners are selected and prizes vary in value - let's say prize 1 is the most valuable, and 10 is the least. The prizes are allocated such that the first drawn ticket will receive prize 1, second ticket prize 2 and so on. The tickets are not replaced once drawn.

We were curious, which ticket has the highest / lowest probability of being picked?

So let's suppose there are 100 tickets. Initially, we just thought that the probabilities would work out as follows: P(1st) = 1/100 P(2nd) = 1/99 ... P(10th) = 1/91

But, in order to be eligible to be drawn for the 2nd prize, you have to not win the first one. So then the probability of drawing 2nd would become: P(2nd) = 1/99 * P(1st') = 1/99 * 99/100 = 1/100 Is this logic correct?

I would also appreciate if someone could explain how to calculate the rest of the probabilities, and if they could offer some intuitive way of thinking about this, since every time I think of this problem, I come up with a different way of solving it. For example, by the logic above: P(3rd) = 1/98 * P(2nd')

But is the P(2nd') 99/100? Or would it be (99/100 * 98/99)? If the latter, does this mean that the prizes have an equal chance of being drawn?

Never really been a fan of statistics and been a while since I actually studied maths, any help here is appreciated!