Please help me I need help with this as quick as possible my dad is right next to me...

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

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.