Eliminate the parameter, t to obtain the cartesian equation in x and y. Sketch the curve, taking note of any restrictions

a)

b)

where V, g and a are constants

c)

I know it's a lot and i really dont expect this all to be answered, i just put all the questions which i had serious trouble with and i would be SO grateful to anyone who could give me a few pointers on how to solve these because i just dont know how to get rid of the t OR find the restrictions. again , i know there are alot of questions and im not just expecting answers or a cheap way to get answers for hw, i realli just dont understand it and would seriously appreciate any help .

thankyou guyz !