What is Negative 2 (3 x + 12 y minus 5 minus 17 x minus 16 y + 4) simplified?

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i

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.

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18