What is y= 4^x with the domain of (-2,0,3)

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.