Given a∥b, and c is not parallel to a or b, which statements must be true?

What does the first stage of a multistage rocket do?

During a load test, a battery's voltage drops below a specified value. what action should the technician take?

Which labels do x and y represent? x: scattered bundles y: multiples of four or five x: scattered bundles y: multiples of three x: bundles in a ring y: multiples of four or five x: bundles in a ring y: multiples of three