If y varies directly as x and given y=9 when x=5 find y when x=15

True or false? if the sequence x, y, z is arithmetic, then 3x, 3y, 3z is geometric. explain.

Which of the following statements is not equivalent to the statement, "there exists either a computer scientist or a mathematician who knows both discrete math and java." select one: a. there exists a person who is a computer scientist and who knows both discrete math and java or there exists a person who is a mathematician and who knows both discrete math and java. b. there exists a computer scientist who knows both discrete math and java or there exists a person who is a mathematician who knows both discrete math and java. c. there exists a person who is a computer scientist or a mathematician who knows both discrete math and java. d. there exists a person who is a computer scientist and who knows both discrete math and java or there exists a mathematician who knows both discrete math and java. e. there exists a person who is a computer scientist or there exists a person who is a mathematician who knows discrete math or who knows java.

The width of a rectangle is 2 less than twice its length. if the area of the rectangle is 147 cm^2, what is the length of the diagonal? the length of the diagonal is cm.