15 : find the equation of the tangent line to the parabola y=x^2 at the point (2, 4). hint: a line y-4=m(x-2) is the tangent to the parabola if and only if the line is non-vertical and the nonlinear system
y=x^2
y=m(x-2)+4
has exactly one solution.

In an experiment you are to flip a two sided coin 100 times and record 55 heads up and 45 tails up determine the theoretical and experimental probability of getting a heads up in the experiment.

The system of equations graphed below has how many solutions? y = 2x + 2

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.