Can you help me please ​

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?

Write the expression as a single natural logarithm. 2 in a - 4 in y

Will mark brainliest! ( explain the answer too, it can be one sentence)