Amixture of purple paint contains 6 teaspoons of red paint and 15 teaspoons of blue paint. to make the same shade of purple paint using 35 teaspoons of blue paint, how much red paint would you need?

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4