The sum of n a. m.'s between two numbers is 20. if the last mean is double of the first and one number is three times the other, then find the number

Determine the next term in the sequence. then write the next 2 terms 4,16,28, what number do you do to get that?

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take

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.