PLease help! I'll mark brainilest

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?

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

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10