A speed boat travels from A to B for the first part of a journey and then B to C to complete a journey. For the entire journey, A to C, the boat travels at an average speed of 21 kmph.
During the journey, from B to C, the boat only travels at a speed of 13 kmph
Calculate the percentage decrease in average speed between the first and second part of the journey, given that the distance off each part is equal.

The number of members f(x) in a local swimming club increased by 30% every year over a period of x years. the function below shows the relationship between f(x) and x: f(x) = 10(1.3)xwhich of the following graphs best represents the function? graph of f of x equals 1.3 multiplied by 10 to the power of x graph of exponential function going up from left to right in quadrant 1 through the point 0, 0 and continuing towards infinity graph of f of x equals 10 multiplied by 1.3 to the power of x graph of f of x equals 1.3 to the power of x