\sqrt{(3\sqrt{2} -\sqrt{14} )^{2} }
I am really having trouble with this, any pointers?

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

Timmy uses 1 1 2 cups of sugar for every 2 gallons of lemonade he makes. how many cups of sugar would timmy use if he makes 13 gallons of lemonade?