Charlie uses the function f(x) = 2x2 + 5x + 3 to track the temperature of a substance, where x represents the time. when you evaluate f(5) you find that the temperature of the substance is 78°c. what is the domain of the situation of charlie's quadratic function?

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.