When you gave your friend a fifty-dollar bill for an ipod, you used money as:
a. a standard
b. store of value
c. medium of exchange
d. measure of value

Medium of exchange.

Explanation:

The $50 is given in exchange for an iPod, therefore in the question's illustration money serves as a medium of exchange. Money as a medium of exchange means that money is needed when conducting business transactions that involves buying and selling.

among other factors, composers started writing dynamic markings in their scores because "new instruments allowed for more dynamic ranges and contrast."

dynamics allude to the loudness or softness of music. dynamics offer an approach to demonstrate articulation in sheet music. they to drive the enthusiastic substance of music through volume and force. maybe you could alter both the volume and the shading profundity on your screen at the same time. we can likewise think about the force side of elements as the quality of a note. a few notes are intended to be played delicately and gently, while others are intended to be played all the more firmly.  

some dynamics markings have a letter 'm,' which remains for mezzo, signifying 'medium.' so a mezzo piano unique stamping resembles this (mp) and intends to play medium calm, while a mezzo specialty dynamic resembles this (mf) and intends to play medium loud.