According to Aristotle, the natural motion celestial objects exhibited was A. straight down
B. none of these
C. straight up
D. circular

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

The substances that are necessary for producing of certain hormones and that store and transport vitamins

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.