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19. What is the probability of tossing a penny and landing on heads two times in a row?
20. The area of one playing card is 24 square centimeters. 52 cars are stacked on top of each other to make a deck. What is the volume of that solid deck?

Respuesta :

AL2006
19). 
The probability of landing on heads the first time is 1/2.
The probability of landing on heads the second time is 1/2.
The probability of landing on heads both times is

                             (1/2) · (1/2)  =  1/4  =  25% .

20).
The volume of the solid deck is

               (length · width)  ·  (height)

           =          (24 cm²)   ·   (52 · the thickness of each car) .

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