What is the vertex of the graph of the function below y=x^2-8x+12

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?

What will be the end result for the taxpayer who filed his federal income tax return using the 1040ez form shown belowa he'll owe $173b he'll receive a refund of $173c he'll owe $3921d he'll receive a refund of $3921