Please help me I will give you the brain thing and extra points (image below) 4/5

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?

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?