Upper and lower quartile? what do they mean?

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2