Ashelf holds 3 novels, 2 biographies, and 1 history book. two students in turn choose a book at random. what is the probability that the students choose both biographies?

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

What other information do you need to prove triangle dac=bca by asa