Thanks alot but can you tell me the best way to know the behaviour of the slope specially with concave functions ! not the straight line functions
yes yes ... now its very clear .. thank you melody ...
yes your answer is correct but I don't understand why you take 15 !! why not 20
in this step !
0.5*5*30+|0.5*-20*15|
haha .. sorry its by mistake
verrrrrrrrrry clear ... thank you alan and cphill ...
but your comment is very harsh
!!!!! thank you melody !!!
very nice alan =D I undrstood that
alan I'm waiting you !!!
ok verry nice I understood the example .. but here I want to ask about the answer in the red square is it correct ...