Can someone tell me what the answer is

Which exponential function has an initial value of 2? f(x) = 2(3x) f(x) = 3(2x)

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

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?