There are chickens and cows in a pasture. the farmer counts 40 heads and 100 feet. how many cows are in the pasture, and how many chickens are in the pasture?

Asphere has a diameter of 10 in. what is the volume of the sphere?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Describe the symmetry of the figure. identify lines of symmetry, if any. find the angle and the order of any rotational symmetry.