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genyjoannerubiera
29.06.2019 •
Mathematics
Aboard is made up of 9 squares. a certain number of pennies is placed in each square, following a geometric sequence. the first square has 1 penny, the second has 2 pennies, the third has 4 pennies, etc. when every square is filled, how many pennies will be used in total? a 512 b 511 256 d 81
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Ответ:
B) 511
Step-by-step explanation:
1. How many pennies are in the last square:
Sequence: # of pennies = 2^(box # - 1)
Plug in: # = 2⁸
Solve: # of pennies in box 9 = 256
2. Process of elimination:
Not C or D, since the total must be greater than 256.
So the answer is B, not A, since 2⁰ + 2¹ ... 2⁷ = 2⁸ + 1.
Ответ:
x=3In(27)/4In(34)-In(27)