Question

How to find the value of (- antilog 7.4)

Answer 1

see the value of 0.4 in 0 you will get the anti log 
and from mantissa -7 subtract -1 you will get 8 
place the decimal at 8th place
the answer is 25,118,864.315096

Answer 2

let  y = 7.4 
7.4 is a logarithm of some number x

=> Log₁₀ x = 7.4

so  - antilog 7.4 is :      - 10⁷.⁴ =  - x
                            find 10 power 7.4 to get answer.
   - x = - 25118864.315