Which postulate is it that shown on the picture ?

The average of 5 distinct scores has the same value as the median of the 5 scores. the sum of the 5 scores is 420. what is the sum of the 4 scores that are not the median? * explain how you found the answer * a) 315 b) 320 c) 336 d) 350 e) 360

What is the value of the expression below? (81^2)^1/8

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.