a rectangle is 81 m long and 54 m wide what is the length around it of it is formed by to semi circle at the ends​

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?

How many solutions does the nonlinear system of equations graphed bellow have?

With number 11 ( show how you got the answer)