Which of the following is the right answer?

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

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?

Aline passes through 3,7 and 6,9 what equation represents the line