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What did people do before hydroelectric generators was invented?
theyusedwinpower theyusedwinpower
How was the elevator invented?
people invented it
A class comprises 26 students During a mathematics test one student made 12 mistakes and the rest of the class made less mistakes than he did. Prove that there were at least 3 students in the class wh?
I got that question too. It's very badly worded. When they are asking for 3 students in the class that made the same mistakes, they are not asking for at least 3 people that made 12 mistakes. They're asking for u to prove that there were at least 3 people that made the same mistakes as eachother.
What is the Reason Why Abacus is Invented?
The abacus was invented to help people calculate.
A class had 26 students in a test one student made 12 mistakes the rest of the class made less mistakes than him prove that at least 3 people in the class made the same number of mistakes?
You have 25 other people. If 2 people made the same number of each mistake from 0 to 11 this would only account for 24 people, so at least one particular mistake must have been made by 3 people. 0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11. This accounts for only 24 people...
Who invented the eraser pencil?
Lipman... He actually invented the pencil eraser on top of the pencil because people kept making mistakes. How hard it would without making any mistakes.
What are resiliant rubbers?
Resilient means that they deform very little and return to their original shape when the load is removed - they are what most people would tend to call hard rubbers For instance - tyre rubber
How did people live before airplanes were invented?
Crawling
What did people use before the zipper was invented?
Buttons.
What did people use before motorcycles invented?
bikes
What did people use before couches were invented?
benches
What did people use before dynamite was invented?
pickaxes
Who invented the shoelace?
Shoelaces were invented long before people bothered to keep records of such things.
What people did before the refrigerator was invented?
Before the refrigerator was invented, people used iceboxes, which were essentially big coolers with a block of ice. Even before that, food was preserved by salting, curing, smoking, drying, and canning.
What did people do before hydroelectric generators was invented?
theyusedwinpower theyusedwinpower
How did people reserch before the internet was invented?
they read books.
What do people use before window screens were invented?
Fingernails!!
