Which expression is equivalent to 6 - (-21) ? *
O 6-21
O 6+21
O-21-6
0 -21 +6

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.