How much heat do you need to raise the temperature of 150g of ice from –30oc to –15oc?

The heat needed to raise the temperature of a substance by  is given by

where 
m is the mass of the substance
is its specific heat capacity
is the increase in temperature.

In our problem, the mass of the ice is , the specific heat capacity of ice is  while the increase in temperature is , so the amount of heat needed is