At the command prompt, type echo 'You have $$4\mathrm{.}50\text{'}$ and press Enter. What is displayed on the terminal screen? Did the single quotation marks protect this metacharacter from shell interpretation?

$10$

At the command prompt, type echo "You have $$4\mathrm{.}50"$ and press Enter. What is displayed on the terminal screen? Did the double quotation marks protect this metacharacter from shell interpretation?

$11$

At the command prompt, type echo You have $$4\mathrm{.}50$ and press Enter. What is displayed on the terminal screen? Did the backslash protect this metacharacter from shell interpretation?

$12$

At the command prompt, type echo My name is $`$whoami$`$ and press Enter. What function do back quotes perform?