In mathematics, multiplication can be represented by using the symbol × or the symbol ·. Moreover, multiplication can be also represented just by leaving the numbers or values side by side without any symbol. For example, the expression 5x + y implies 5 should be multiplied by x. In this context, the expression (73)5 • 74 indicates 5 should be multiplied by 74, and the result of this should be multiplied by 73 as the lack of symbol indicates multiplication. Therefore, this is equivalent to 73 • 5 • 74.
We can see from this survey that 7 teenagers prefer rock and roll. The number of all teenagers in the survey is: 12 + 5 + 7 + 6 + 6 + 4 = 40 P ( rock ) = 7 / 40 Answer: C ) 7 / 40
