Is this point (20, 13) on this line? Explain your reasoning.

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

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.

What is the area of the shaded sector?