What values are needed to make each expression a perfect square trinomial?

x2 + 4x +

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

The constitution gives congress the power to create federal courts lower than the supreme court higher than the supreme court equal to the supreme court, unaffected by the supreme court.

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /