Solve for a_4
a_{4}=640
Assign a_4
a_{4}≔640
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a_{4}=5\times 2^{7}
Subtract 1 from 8 to get 7.
a_{4}=5\times 128
Calculate 2 to the power of 7 and get 128.
a_{4}=640
Multiply 5 and 128 to get 640.
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