I’ve been stuck on this question for a while, can anyone help?

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.