A chessboard has 64 squares. George places 1 grain of rice on the first square, 2 grains on the second square, 4 grains on the t
hird square, 8 grains on the fourth square, and so on, until he has placed grains of rice on 10 squares.
2 answers:
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As points, x-intercepts take the form 
, so to find the intercepts we can set 
and solve for 
.
From the first equation alone, we already know that
is a solution, which means one intercept is 
.
The second equation gives
so that the second intercept occurs at
.
So if
and 
, we have 
, giving C as the answer.
From the first equation alone, we already know that
The second equation gives
so that the second intercept occurs at
So if