Area of a circle with a diameter of 4cm

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points