Three times antonios age plus 2 times sarahs equals 14. sarahs age is also twice antonios age. how old is sarah

We just started the introduction into circles and i have no idea how to do this.

What is the equation of the parabola with focus (-1,-1) and directrix y=1?

Ashley spent half of her lunch money on a turkey sandwich. then she spent two-thirds of the money she had left on a bottle of juice and the rest of the money on a cookie. if the cookie cost $.75, how much lunch money did ashley have to start with?