Find an expression in terms of n for the number of grey tiles in pattern n?

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Which statement about the annual percentage rate (apr) is not true?

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?