Susan, debra, and sally are serving as subjects in a psychology experiment. each will be taught to ride a bicycle. susan will be taught by an expert instructor, debra will be taught by a video demonstration, and sally will be given a book on bicycles. the amount of time it takes each student to learn to ride will be recorded. this is likely a study of

24-karat gold is considered to be pure gold. 18-karat gold is considered to be about 75% gold. what is 18-karat gold considered a mixture rather than a pure substance? a) it has a variable composition of other elements and minerals. b) its color is different than pure gold. c) the gold atoms are not arranged in a repeating pattern. d) it can be melted and transformed into a different substance.

Where was goodyear located? a) northeast b) southeast c) northwest d) southwest

What was the focus of debate about the war at the second