Find the surface area of the triangular prism shown below. 5ft 5ft 3ft 7ft 8ft .

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

Events a and b are independent. the probability of a occurring is 2/5. the probability of b occurring is 1/4. what is p(a and b)?