7. (1,2),(0,-1)
slope = (-1 - 2) / (0 - 1) = -3/-1 = 3 <==
8. (-1,0),(1,-1)
slope = (-1 - 0) / (1 - (-1) = -1 / 2 <==
F(x) = (x -2)(x +3)(x +5)
.. = x^3 +6x^2 -x -30 . . . . . your polynomial in standard form.
I think it's two-sixths, or one-third in simplest form. Since Josh and Chris are only two out of the six racers in that race, the probability that Josh and Chris will get an outside lane in the fist heat is one-third.
Here is an example of showing two angles are congruent using the reflexive property of congruence: Separating the two triangles, you can see Angle Z is the same angle for each triangle. Since they are the same angle, the angle is congruent to itself.
I think it’s 27 3/4 since you just had the 21 and 6 together and it should be the same fraction