HELP PLEASE HOMEWORK ASSIGNMENT

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.

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?