A normal distribution has a mean of 10 and a standard deviation of 1. What is the probability of selecting a number between 7 and 13

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

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

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?