Problem A relay race covers 1\dfrac121 2 1 ​ 1, start fraction, 1, divided by, 2, end fraction kilometers, and each runner on a team will run \dfrac14 4 1 ​ start fraction, 1, divided by, 4, end fraction of a kilometer.

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?

Which of the following contains a variable?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)