Work out the area of the right-angled triangle

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2