Does anyone have a good website to solve for pythagorean theorem???

Which formula finds the probability that a point on the grid below will be in the blue area? p(blue) = total number of squares number of blue squares number of blue squares p(blue) = total number of squares number of blue squares p(blue) = number of white squares

What is the measure of angle tvu shown in the diagram below

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10