What is the length of the arc shown in the red?

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.