The average of 6,10,x,20 and 30 is 18. what is the value of x​

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Can someone me do math because i am having a breakdown rn because i don’t get it

If you could answer these your a life saver