Let me know if per means multiple and of is to divide

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

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?

What ia the sum if the first 7 terms of the geometric series