Give an algebraic proof that 2n choose 2 = 2 (n choose 2) +n^2

How do you multiply a mixed fraction by a regular fraction

What is the celsius temperature that is equal to 94 degrees fahrenheit using the formula f=9/5 c+32

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?