Evaluate a/b for a= 1/2 and b= - 3/7 a) - 7/6 b) 3/14 c) - 3/14 d) - 32/21 explain your answers. : )

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

Can someone me with this problem i don't understand i need

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.