Maria borrowed $300 from her parents. She agreed to pay them back 15 each week. Which equation shows how much money, M, Maria owes after n weeks

Anyone know? is appreciated! will mark brainliest if correct!

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.