Matematik tingkatan 3 hukum indeks indeks pecahan​

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?

Reflect the point (7,0) across the y-axis

In the diagram, gef and hef are congruent. what is the value of x