exam Maths Puzzle Numerical Ability

I need help with 3a/a+1 + 4/a-2 =3

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exam Other Question

Velocity. If a ball is dropped from a height of 256ft. then the formula v(t)=
-32t expresses its velocity in feet per second as a function of time in "t" seconds.
a) Find the v(0), the velocity of the ball at time t=0
b) Find v(4) describe the resulting graphs by identifying the vertex point, the graphs direction and any axis intercepts gleaned from the table or graphs

y = x^2 - 4x