100 POINTS!! WILL MARK BRAINLIEST NEED RESPONSE ASAP PLEASE AND THANK YOU!!

A feasible region is bounded by the constraints:
y ≤ 20-x
{ y ≥ 20-4x
y ≥ 5-0.25x

The objective function is P = 3x + 5y.

(a) Graph the feasible region.
(b) Find the value of the objective function at each vertex of the feasible region.
(c) What is the minimum value of the objective function, P?
(d) At which vertex point does the minimum value occur?
Show all work.