Arthur is training for a 5 kilometer race. He is running around a track that is 400 meters long. He needs to run 2 kilometers at today’s practice. How many times does he need to run around the track?

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

Find 1/8 of 12. express your answer in simplest form.

Which equation shows an equation equivalent to x^2+12x+7=0