exam Maths Puzzle Numerical Ability

When x number of units are sold, the price of each unit (in dollars) is given by p = -x/2 + 75. Find the unit price when the following quantities are sold: 2,7,9,11.

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exam Other Question

Help please. I can not seem to get this problem right.
f(x)=-4x-2
What is the slope?
The y-intercept is (0,?)
Thanks for your help ahead of time! Write equation for a parabola with a focus at (0,5) and a vertex at (0,0)