Q1. The pressure at sea level is 1 atmosphere. For every 10 metres that a diver descends into the sea, the pressure increases by 1 atmosphere. (i) What is the independent

variable? What is the dependent variable? (ii) Sketch a graph, putting the independent variable on the horizontal axis. (iii) Find the slope of this line and express it as a rate of change. (iv) Write the equation of the line and write the pressure as a function of the depth.