if log 1087.5 = 6.9421 , then the number of digits in ( 875 ) 10 is ?
"x = ( 875 ) 10 = ( 87.5 x 10 ) 10 therefore , log 10 x = 10 ( log 1087.5 + 1 ) = 10 ( 6.9421 + 1 ) = 10 ( 7.9421 ) = 79.421 x = antilog ( 79.421 ) therefore , number of digits in x = 80 . answer : c"
add(multiply(const_4, 6.9421), divide(log(const_100), log(const_10)))