Factor a^2 + 3a + 8a + 24 by grouping

a. 8a(a + 3)

b. (a^2 + 3a) (8a + 24)

c. cannot be factored

d. (a + 3) (a + 8)

D, FOIL out the possible answers, a×a = a^2, a×3 =3a, a×8=8a, and 3×8= 24

The right answer for the question that is being asked and shown above is that: "A data point is 1.3 units above the line of best fit."  a residual value of 1.3 mean when referring to the line of best fit of a data set is that A data point is 1.3 units above the line of best fit.