What is the minimum value of |x|?

In an examination, 70% students passed in Physics, 80% students passed in Chemistry, 75% students passed in Mathematics and 85% students passed in Biology, and x% students failed in all the four subjects. What is the minimum value of x ?

What is the minimum value of x^x , x > 0 ?

Consider the function f(x)=(x^(2)-1)/(x^(2)+1), where x in R. At what value of x does f(x) attain minimum value? What is the minimum value of f(x)?

A small ball is rolled with speed u from point A along a smooth circular track as shown in Fig. 3E.33. If x = 3R , determine the required speed u so that the ball returns to A, the point of projection. What is the minimum value of x for which the ball can reach the point of projection ?

A small ball is rolled with speed u from piont A along a smooth circular track as shown in figure. If x=3R , then What is the minimum value of x for which the ball can reach the point of projection after reaching C?

A small ball is rolled with speed u from point A along a smooth circular track as shown in figure. If x=3R , then What is the minimum value of x for which the ball can reach the point of projection after reaching C?