The density of blood is 1.05 kg/m3, find the mass of a bag of blood for a transfusion, if the volume is 2.0 m3.

 M = 2.10kg

Explanation: We know that the density of blood is d = 1.05 kg/m^3

This means that each m^3 of blood weighs 1.05kg

So in 2m^3 of blood, the mass will be two times the one that we had before.

M = 2*1.05kg = 2.10kg

This also can be calculated as:

M = 2m^3*1.05kg/m^3 = 2.10kg*(m^3/m^3) = 2.10kg

3

step-by-step explanation:

10 - 2.8 = 7.2

2 2/5 = 2.4

7.2 / 2.4 = 3

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)