Let a = { 0, 1, 2, 3, 4, 5, 6 }, let b = { 0, 1, 2, 3, 4, 5, 6, 7, 8 }, and let r be the relation from a to b given by "the greatest common divisor of a and b is 2." [note: "greatest common divisor" is sometimes called "highest common factor".] list the elements of r.

Answerboth technicians;

By checking for voltage with a neon tester;

Hypothesis: volumes of both figures are equal.the volume of  figure 1 is: .the volume of figure 2 is: .since , you can conclude that and . so, .volumes of figures are equal only when an angle in the basis is right (then figures will be the same), in another cases volume of figure 1 is less than volume of figure 2.the hypothesis was not correct in all cases.