Trapezoids. Find AD Please It's for a quiz the faster the better thanks

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

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.  

Apply distributive property to write equivalent equation 105×35m