Lisa studies 5 hours for a particular test and gets a score of 77. at this rate, how many hours would she have to study to get a score of 99?

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost