Some please help ASAP I’m taking a test and I need help :(

Determine the relationship of ab and cd given the following points

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.

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.