Which of the following is the best use for the sign chart when graphing rational functions?
A. To check whether F(x) is a straight or curved line for values of x
B. To check whether F(x) has a positive or negative slope
C. To check whether F(x) reaches a maximum or a minimum
D. To check whether F(x) is positive or negative for values of x
E PREVIOUS

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.