2x^2+12=2x^6+20
im having hard troubles with this problem

Subscriptions to a popular fashion magazine have gone down by a consistent percentage each year and can be modeled by the function y = 42,000(0.96)t. what does the value 42,000 represent in the function?

Icould really use some with this question.

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64