Will give brainliest a zoo train ride costs $3 per adult and $1 per child. on a certain day, the total number of adults (a) and children (c) who took the ride was 30, and the total money collected was $50. what was the number of children and the number of adults who took the train ride that day, and which pair of equations can be solved to find the numbers?

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).