Acar dealership has seven cars in the lot. unfortunately, the keys to the cars have been mixed up. the manager randomly grabs a key and tries to start a car salesman also randomly picks a different key and tries to start another car. what is the probability that both cars start?

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

Which of the following can be used to explain a statement in a geometric proof?