Riley is doing an experiment working with friction. he wants to find two ways to modify an object that could increase or decrease the same type of friction.
which methods could he use to perform his experiment?

the answer is B increasing the surface area and areodynamic design. Just took the test .

Explanation:

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

i belive it is water