100 Points + Brainliest! I need the slops of these 3 coordinates! 1 What is the slope of line segment PQ with coordinates P(-2,5) and Q(-1, 1)?

2 What is the slope of line segment QR with coordinates Q(-1, 1) and R(7,3)?

3 What is the slope of line segment PR with coordinates P(-2, 5) and and R(7,3)?

Consider the linear model for a two-stage nested design with b nested in a as given below. yijk=\small \mu + \small \taui + \small \betaj(i) + \small \varepsilon(ij)k , for i=1,; j= ; k=1, assumption: \small \varepsilon(ij)k ~ iid n (0, \small \sigma2) ; \small \taui ~ iid n(0, \small \sigmat2 ); \tiny \sum_{j=1}^{b} \small \betaj(i) =0; \small \varepsilon(ij)k and \small \taui are independent. using only the given information, derive the least square estimator of \small \betaj(i) using the appropriate constraints (sum to zero constraints) and derive e(msb(a) ).