What is each number written in scientific notation? 2. 1,220,000,000 a) 1.22 x 10 b) 0.1222 x 10^10 c) 12.2 x 100^8 d) 1.22 x 10^9

99 points at a zoo, the leopard pen has a ring-shaped sidewalk around it. the outer edge of the sidewalk is a circle with a radius of 12 m. the inner edge of the sidewalk is a circle with a radius of 8 m. (1 point for showing all of your work) a. write and simplify an expression for the exact area of the sidewalk. (1 point for the answer) b. find the approximate area of the sidewalk. use 3.14 to approximate π. (1 point for the answer)

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

1: 4 if the wew 35 surfboards at the beach how many were short boards?