On a certain day in Beijing this year, the minimum temperature is -7°C, and the maximum temperature is 4°C. What is the difference between the maximum temperature and the minimum temperature on this day?
北京市今年某天的最低气温是-7℃，最高气温是4℃，这天的最高气温与最低气温相差多少．
<gadget id="calculator">4 - (-7)</gadget>
<output>11</output>

<result>11</result>