Yes Calculus CAN BE used.

Drilling deep holes in the ground of the mine. I found the right spot! The rich oil is right here. The other people, Sandra put in the pipe in this hole to pump out the oil. Daniel brought in the barrel to to put the oil in. Sandra went and got the labels to put on the next couple barrels. "Super", and " regular" were already filled. More and more barrels were being filled. They were being checked for inspection. Being sure that oil looks useable for trucks and cars at gas station nationwide. More coal was also being shoveled out the walls of this mine and wagons of coal were being put away.

Proper chemicals were being placed and a certain formula was here to use:

2

d O

L ---------

2

d t

+

da

R ------

dt

+

1

------ q = E° cos wt

c

I used this formula to get the right amount.

I was able to use this amount to use with the pump to help mix up mixtures with dirt and keep the pump in place to keeping a faster speed for oil to flow.

I looked up to Daniel. He is very dependable. I've worked with this guy for eight months now.

Daniel piled up the oil barrels on the crates and I also wheeled in a few more crates and we brought the shipment in the front of the place where our clients come in our store and pick out all the barrels their gas stations need. Usually, we get hundreds of customers. I was mopping the ailes down. Wiped off dirt off the shipment.

After work, Sandra headed home to her family. While Daniel and I hit the Arcade!

Shooting games were the best this afternoon! Daniel bet me by five points the first round, Daniel won again by nine points. I won by four points.

I was walking home from here. I was a ten minute walk. I came across my neigbor, John. "Hey man! My wife and I just got back from work." Said John. "How was it?" "Great! We went to Puerto Rico. One the McDonald's in San Juan." "How long were you there?" "For a week. It was job that had to get done. My boss here in Kentucky said he needed somebody. So my wife and I went. The plane tickets were on sale on tickets.com for the lowest price of $5 for both our round tickets using a promo code." "Good." "In San Juan, Wendy and I enjoyed a couple museams, and the beaches after work. Us crew members had a wonderful time serving these puerto riccan customers and drive thru. Like Americans, they love their fries." "I'm glad you had a good time." "Yes we did. My co-worker, Rich and his girlfriend went to Iceland to work a week in their McDonald's. They are crew members too." "How was their trip? It was great. They took the plane from Oregon to Iceland and got there in six hours. They told me how they also went a couple museams as well after work. They got back today, too." "Great, I'm going to go home now. I hope you have a good night." "Ok."

When I got home, I enjoyed my burritos in front of the TV.

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I'm pasting something in here to fill up space here. I hope you enjoyed the above story about a man and his pretty good day at work.

I quote:

Schwalbe say:

When is a tire worn out?

In bicycle tires the tread is far less important than for instance in car tires. So using a tire with a worn out tread is less of a problem that is of course with the exception of MTB tires.

When the puncture protection belt or the carcass threads can be seen through the tread the tire has reached its wear limit and must be replaced. As puncture resistance also depends on the thickness of the tread layer, it may be useful to replace the tire sooner.

The sidewalls of tires often fail before the tread is worn out. In most cases, this premature wear is due to prolonged use of the tire with insufficient pressure. Checking and re-pumping the inflation pressure at least once a month with a pressure gauge is most important.

• Not all roads in cities are paved, in particular not all bicycle roads. – 
• gerrit
•  yesterday
• 5
• To start with, most urban cyclists do not ride exclusively on paved roads. When cycling around town myself, I regularly have to deal with sections of road/sidewalk that are about equivalent to a gravel trail, and I occasionally have to ride through sections of poorly kept grass. I would not even consider a racing or velodrome style for this simply because it would not give enough traction on those areas (especially if the grass is wet) to be able to safely turn when moving at otherwise reasonable speeds. – 
• Austin Hemmelgarn
•  yesterday
• Do you really think tyres show no different performance on wet or dry roads? – 
• Robbie Goodwin
•  23 hours ago
• 2
• @RobbieGoodwin If your comment was meant for me, of course I know that roads (and certain parts of roads e.g. paint and metal) can be more slippery when wet. What I don't know is whether treads on tires help with that, at all. – 
• ChrisW
•  17 hours ago

Schwalbe has another page on this - https://schwalbetires.com/technology-faq/tread/#:~:text=On%20a%20normal%2C%20smooth%20road%2C%20the%20tread%20has,smaller%20and%20the%20contact%20pressure%20is%20much%20higher.

On smooth road, slick tires perform best in all conditions (unless you doing over 200km/h), however in rough roads tread provides predictability, which is far more important than absolute grip on a bicycle. Choice of tire you use should be based on the types of road you ride (and in some countries, tread is a legal requirement). Keep in mind that few of us are in the luxurious position of riding perfectly smooth roads all the time.

This is different to what you have, which is a worn out tire. The tire shop has to advise you based on lots of factors - but the liability and reputation precludes them advising a worn out tire is safe to ride. If the country you requires tires to have tread, they would probably be legally bound to advise you to replace the tire.

Given all this, IMHO they are being professional and have advised you correctly.

You still have a choice, the liability of your decision not to replace the tire lies with you. The real risk of running worn tires (as long as you keep an eye on them) is they are more vulnerable to punctures. Riding once the chords show though can lead to catastrophic tire failure, which can cause crashes, but you really need to ride well past the chords just showing in one spot. The loss of predictability of a worn tire in adverse conditions can be mitigated with riding style.