Urgent help needed! thankyou! (help needed for (b) and (c). which is why i put 20 points. 10 for each question)

step-by-step explanation:

no solution.

b. b < 1 might be the correct answer

step-by-step explanation:

let pq = qr = rs = x, and xz = y and zu = z.

if the horizontal lines are parallel, then corresponding segments are in proportion:

substitute:

therefore 3 = y = z.

xu = y + z → xu = 3 + 3 = 6