The velocity of a particle varies directly as the product of its position and time squared. the particle has known positions s(0) = 3 and s(2) = 5. answer the following.

i am not sure if the differential equation is ds/dt=k(s+t^2)

(where s=position and t=time)

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.