so if i want to perform a function on elements from a list i do 

X:=[3, 5, 6, 7]

add(x*ln(x), x = X)

but what if i want to have two lists X and Y and perform the function x_i*ln(y_i) and add that up?

PS: keep in mind that im working with integers aswell as floats

thanks :)

So if i have a list of numbers X:=[1, 3, 8, 9, 10] for example, how do i calculate the Σx*ln(x) for each x in X ?

im certain it must be possible but i cant figure out how.

thanks for your time :)

i want to plot the region D={(x,y)|0<=x<=1,0<=y<=1-x} in a 2d plot. how to i do this in the most possible way?

i know im supposed to use with(plots) and then implicitplot() but i cant seem to get it right...

any help is appreciated :)

i have been given the simple assignment to sketch the region consisting of points whose polar coordinates satisfy the given coordinates:

2<r≤5,   (3*Pi)/4<θ<(5*Pi)/4

i know how it is supposed to look, but how do i plot it?

I have been playing around with the polarplots function for a good hour now, but with no luck

Thank you for the help