The diameter of a circle is 19 7/8". What is the circumference (to 2 decimal places)? Please note:

C = πd

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?

Divide. write in simplest form 41/6 divided by 10

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0