A bag contains a mixture of identical coloured balls. The probability of selecting a blue ball from the bag is 0.4
(a) Calculate the probability of not selecting a blue ball
(b) If there are 80 balls in the bag, calculate how many are not blue

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)