Using the quadratic formula to solve x^2 + 20 = 2x, what are the values of X?

The graph of f(x)=|x| is reflected over the y-axis and horizontally compressed by a factor of 1/9. write a formula for function g(x)

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)