What is 28/50 as a decimal

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Which graph represents the linear function below? y-3=1/2(x+2)

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.