Three vectors A, B, and C add together to yield zero: A + B + C = 0. The vectors A and C point in opposite directions and their magnitudes are related by the expression: A = 2C. Which one of the following conclusions is correct?

A general system of forces and couple moments acting on a rigid body can be reduced to a ___ .

A 75-year-old woman has been advised by her neighbor to take a multivitamin and mineral supplement. What benefit might she get from taking it?

The triple scalar product u • ( r × F ) results in

Which of the following statements about individual differences in early vocabulary growth is true?

Which of the following is an example of the grammar development process of overregularization?

The extent to which parents ________ contributes strongly to early language process, which, in turn, predicts intelligence and academic achievement in elementary school.

Direct democracy allows the voters in a state to write laws, amend constitutions, remove politicians from office, and approve decisions made by government.

___________________an election in which only voters registered with a party may vote for that party’s candidates

_______________the result when a popular presidential candidate helps candidates from his or her party win their own elections