Given two numbers on a number line, we can find the distance between them using the absolute value of their difference:
[tex]d(x,y)=|x-y|[/tex]in this case, we have 16 and -9, then:
[tex]d(16,-9)=|16-(-9)|=|16+9|=|25|=25[/tex]therefore, the distance between point P and point Q is 25