Final answer:
The pressure exerted is calculated using the formula P = F/A, which results in (4/x) when the applied force is 20 units and the area is (5x). The provided options do not match the correct calculation.
Step-by-step explanation:
The question asks to calculate the pressure exerted when a force is applied to an object with a given area. Pressure is defined as the force applied per unit area. In this case, the force applied is (4x5) which equals 20 units of force, and the area is (5x). The formula for pressure is P = F/A, which here becomes P = 20/(5x). To find the pressure in its simplest form, we divide 20 by 5x, resulting in a pressure of (4/x). None of the options provided (a) (20/5)^2, (b) (10/5)^2, (c) (15/5)^2, and (d) (5/20)^2 match the result (4/x). Therefore, there seems to be an error in the answer choices provided, as none correspond to the correct calculation of pressure in this scenario.