Which equation has a graph that is a parabola with a vertex at (-2, 0)? y= -2x^2
y = (x + 2)^2
y= (x – 2)^2
y= x^2 – 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.