The graph in Fig 1. depicts a gentle change in atmospheric temperature from T1 over the se...

The graph in Fig 1. depicts a gentle change in atmospheric temperature from T1 over the sea to T2 over land. The temperature profile is described by the function

where x is measured in kilometers and x = 0 is the sea-land boundary, (a) In which direction does ∇T point and (b) at what value of x is it a maximum?

Fig 1