What is a lineer model for the data

the term is often taken as synonymous with linear regression model.

Step-by-step explanation:

the term linear model is used in different ways according to the context. The most common occurrence is in connection with regression models and

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°

a. is correct