2.1n - 5.31 = 18

Pls help please show work

Write two subtraction equations that are equivalent to 5 + 12 = 17.

What is the y-intercept of the line given by the equation

Taber invested money in an account where interest is compounded every year. he made no withdrawals or deposits. the function a(t)=525(1+0.05)^t represent the amount of money in the account after t years. how much money did taber origanally invested?