What is the distance beetween -25 and -12

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Suppose that in 2008 , 840,800 citizens died of a certain disease assuming the population of teh country is 399 miliion, what is the mortality rate in units of deaths per 100,000 people?