The horizontal surface of a table is located 72 centimeters above the floor. If the x-axis is parallel to the floor and the edge of the table is touching the y-axis, what is the equation for the surface? A. y=72x

B. x+y=72

C. y=72

D. x=72

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