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That is my new search engine now

Yes it is and see Tomson's link

x = starting number

x * .5  = number after first round

(x *.5) * 1/3   = after the second round = 24

x * .5  * 1/3 = 24         solve for 'x' to find starting number of students

ok I assumed I helped! 

Me too!
I make many!
 

These are the two out of (dozens?) mistakes I made

OHHHH so  i  was using it correctly or no.... 

and btw thanks CU :DD

yes im sure parallelograms do not have perpendicular diagonals,,, only rectangles, some rhombi, and squares do so.

but why would you have to prove that your diagonals bisect each other? I thought that only applied to rhombi...

 

oops! At least you know what NOT to do.

Also, I think the Absolute value means that the length or magnitude is positive, because segments can't be negative.

I know less than you lol. I am researching as I post this.

There are actually multiple ways to prove it, do you HAVE to use your theorem (1)?

Prove that both pairs of opposite sides are parallel.

Prove that both pairs of opposite sides are congruent.

Prove that one pair of opposite sides is both congruent and parallel.

Prove that the diagonals bisect each other.

Also, are you sure Diagonals can't be perpendicular? Because perpendicular diagonals form squares, and squares are parrellelograms.

Thanks for the tips. People always make mistakes...

Like me... see this... https://web2.0calc.com/questions/helppp-meee-im-soo-stuck

algebraic proofs ):

Wha types of proofs are you doing?

Statement Reason?

I knew my mistake lol

I just wanted some tips on how NOT to make mistakes

Sorry I worded my title wrong

After contemplating about this, I made a list of things to do to avoid silly errors (this may help others too)

- No "bullrushing", don't rush your answer once you have an idea, think it through.

- "Mental Check" Different from double checking, this a method where you mentally check if every step in your solution is practical, makes sense, and mathematicall is right (if you can) AS YOU DO IT

- Ask your self the question: "What is the 'problem' of the Problem?". What is the answer you are trying to find?

- Check for traps. For example, a problem might have "label the units" at the end of it, and you might not notice. These are "traps" that can be avoided.

-Neat and tidy. When doing work on paper, keep everything clear so its easier to do the "mental check" and avoids silly reading and calculation errors.

also how would you prove if a quadrilateral is a rhombus and a square? 

im really really really confused ):

oof, my bad... 

You only have a fraction of the fence....you only have 22 out of 36 inches   or  22/36

  so you would pay   22/36  x  8.75 =

This is a simple problem.

set up a ratio:

                         8.75 : 36

                         x : 22

36/22=18/11

18/11 *22= 36.

The answer is: 36

This is a weird question

Also, you can help save trees by using this search engine!

https://www.ecosia.org/

Trees give us oxygen and absorb carbon dioxide, which comes from every time breathing and the things we built. You can also see that the temperature is increasing every single year, it is because of global warming, but trees will help us. Now it is Your time to save the trees. 

By the way. I found your error on your animal problem. 

You said: "According to the problem, there are 6 wings and no other animal has wings. So since chickens have 2 wings, there are THREE chickens.

Since chickens have 2 eyes and 2 legs, we can do 3 * 2 = Subtract 6 from 50 legs and 48 eyes

So we have 44 legs and 42 eyes.

Cats have 4 legs, so there must be 44/4 = 11 cats (fish have no legs)

11 cats * 2 = 22 eyes.

So 42-22 = 20 eyes left.

20 eyes, and fish have two eyes, so 22/10 = 2 fish.

The number of pets is 6 chickens + 11 cats + 2 fish = 19 animals. (do you see the error?)

The answer should be 24"

The right answer: There are 48 eyes, and that means there are 24 pets in total...

each animal has two eyes! 48/2=24!

What you got wrong: it is highlighted above. For the Fish, you said there are 20 eyes left and fish have two eyes, that is right, but later, you did 22/10 instead of 20/2. there are 10 fish. For the final answer, you said The number of pets is 6 chickens + 11 cats + 2 fish = 19 animals​, but I believe you also said that there are 3 chickens---not 6. LOL. The right answer is: The number of pets is 3 chickens+11cats+10fish=24 animals. (you understand now?)

"20 eyes, and fish have two eyes, so 22/10 = 2 fish".

This is where your mistake is: 20 eyes for the fish, 20 / 2 =10 fish

So, 10 fish + 11 cats + 3 birds =24 pets.

Alice and Bob each have a coin. Suppose Alice flips hers 1000 times, and Bob flips his 999 times. What is the probability that the number of heads Alice flips will be greater than the number Bob flips?   

When both Bob and Alice have flipped 999 times, say that each of them has flipped the same number of heads, and they're tied.  Alice flips one more time.  The probability that her coin will land heads (giving her more heads than Bob) is 1/2.  So the answer to the problem is 1/2.  

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The magnitude is the 'amount' ...    the force is  mg cos theta    that is the magnitude......