Explain in terms of particle arrangement why nacl(aq) is a homogeneous mixture

It is a solution comprising of only a single phase

Explanation:

When salt is dissolved in water, the solid completely dissolves in the water to form an aqueous solution of sodium chloride. This aqueous solution of sodium chloride comprises of only a single phase.

A homogenous mixture is known to comprise of only a single phase. Hence if all the particles of solute dissolves and form a single phase with the solvent, the solution is a homogeneous mixture.

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.

the answer to your question is c