The center of mass is defined as a point on the straight line between two objects with masses m1 and m2 such that l1/. what are the coordinates of the center of mass? m1=(x1,x2) m2=(x2,y2)

Simplify the expression 10/11(22z) + (a+5) -1

Can someone explain to me how to do

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g