Emily wants to buy stones on her trip to New Mexico to give at least four of her friends the gift shop sells small stones for four dollars and large stones for six dollars. Emily has no more than $30 to spend. Write and graph a system of linear inequalities

Ineed asap. i cant understand this question i need someone to me right away

Can someone answer it, and plot it, for 20 points and brainliest answer? p. s. they're the same ! : )

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.