So my teacher showed this assignment and answered it but she didn’t even show how she did the work. Can someone help? “Ori can run 5 miles in 45 minutes. How many meters can he run per hour?“

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

Three times the sum of a number and seven is negative thirty-six. what is the number?

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