Which best explains why the world first civilizations developed in river valley's

Which are examples of note-taking tools? check all that recording devices sticky notes digital highlighters paper flags highlighting pens digital displays digital flags

Amedian in the road will be marked with a white sign that has a black arrow going to the left of the median. true false

Given int variables k and total that have already been declared, use a while loop to compute the sum of the squares of the first 50 counting numbers, and store this value in total. thus your code should put 11 + 22 + 33 + + 4949 + 50*50 into total. use no variables other than k and total.