exam Maths Puzzle Numerical Ability

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)

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exam Other Question

Solve.

7x + x(x-3) = 0

Find the x-intercepts of f(x)= 7x + x(x-3)

a. What are the solutions?
b. What are the x-intercepts?

Please help, I keep getting confused and told I do not have the correct answer. The sum of two numbers is twice their difference. The larger number is 6 more than twice the smaller. Find the numbers.