How do I do this for quadratics & complex numbers? Someone help please(8+6i)+(6i)+(6i)

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?

How do you write y-10=2 (x-8) in standard form

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?