Which cell formatting is  most likely  to use $?

currency

Explanation:

    Currencies have a graphical representation generally consisting of two parts: an abbreviation for the monetary standard, which varies from country to country, and the dollar sign, the universal symbol of money, which originates etymologically from the Arabic cifr.

he could use bold or bigger text just a suggestion.

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)