4. (10 pts) Use the sweetheart method (Cross multiplication method) to solve(Show yourwork):X4x-4x-4(5 pts) Explain why your result is not valid.

Given: △abc, ab=15, bd=9 ad ⊥ bc , m∠c=30°. find: the perimeter of the triangle.

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?

15. jiovanni is looking in to two different companies that offer study guides for math exams.test prep 101 charges a $5 flat fee and an additional $0.25 per problem.math charges a $2 flat fee and an additional $0.50 per problem.how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {