A past paper question about sensor output and input

The bias of a discharge air temperature sensor is 3psi.
The minimum value of the input range of this sensor is -10C(temperature) and its output span is 15psi.

It is noted that when the temperature is 0C, the output of the span is 8psi.
Determine the:

(i)maximum value of the output of the span in psi;
(ii)proportional gain of the sensor;
(iii)maximum value of the input of the sensor;
(iv)temperature of the loacation when the psi is 15psi.