Choose the number sentence that illustrates the distributive property of multiplication over addition. A.
8 × (4 + 9) = (8 + 4) × (8 + 9)
B.
8 × (4 + 9) = (8 × 4) + 9
C.
8 × (4 + 9) = (8 × 4) + (8 × 9)

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a researcher conducts a comparison of the comments made in a publicly available blog and the blogger's comments on a similar topic in a weekly magazine. undergraduate students in a field methods class are assigned a research question and asked to interview another classmate, to be followed by a class discussion on interview techniques. a cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem-solving behaviors. a researcher sets up a meeting with the superintendent of a large and diverse public school system to get data about the ethnic composition of the school system and the number of students receiving free lunches.