What is the value of 2 cubed plus 5 squared

Factor this polynomial completely x^2-64

What is the sum of the first 8 terms of the geometric series

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.