Which solution to the equation x/x-1=x-2/2x^2-2 is extraneous?

Yvaries directly as x. y =90 when x=6. find y when x=13

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?

How much would it be worth in 5, 10, 20 years