All rewards given properly no non scene as an answer or i will report you! by what are isotopes identified? a. mass numbers b. atomic masses c. atomic mass units d. average atomic masses

Isotopes are identified by Mass Numbers.  The mass number is the definite number of protons + neutrons in THAT SPECIFIC atom you are talking about.  For example, Carbon-14 is called that because it has a mass of 14 (6 Protons and 8 Neutrons)

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles