Hello guys, I'm a bit stuck on both of these problems and I'd love it if I got help. Points A, B, C, and D are collinear and positioned in that order. Find the length indicated.

9) Find BC if CD = 10x +419, AD = 143, BC = 4x +
176, and AB = 8x + 362.

10) Find CD = 20, AB = 8x - 665, AD = 5x - 316, and BC = -301 + 4x. Find BC.

I would love to get a step by step guide on how to solve problems like these.

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

List the sides of δrst in in ascending order (shortest to longest) if: m∠r =x+28°, m∠s = 2x+16°, and m∠t = x+12°

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)