Hey, I gotta a question, There's 30 cows in a field, 20 ate chickens, how many didn't?

Combined megan and kelly worked 60 hours.kelly worked twice as many hours as megan.how many hours did they each worked?

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?