Question

A basic derivative question
For the below question,why should 0 ≤ x ≤ 20 (why not 0 13 years ago

Answer 1

what is x?

The sum of two non negative numbers is 20 => a+b=20
Did you make a or b, x?

Answer 2

Represent the numbers by x and 20-2 x,

Answer 3

non-negative numbers are 0 and positive numbers

Answer 4

but 0 can never be a side of o trangle

Answer 5

Where is does it mention triangle?

Answer 6

rectangle

Answer 7

oops

Answer 8

I see no mention of rectangle or triangle

Answer 9

wait a sec

Answer 10

I typed the wrong question wait a sec

Answer 11

you solved my problem.Haha

Answer 12

I mixed up this question with another question