From a group of 10 people, 5 are selected at random to participate in a game show. in how many ways can the 5 people be selected?

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

Are triangles the congruent? write the congruency statement. what is the congruency that proves they are congruent? what is the perimeter of ∆pqr?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?