Ada yang bisa bantu? tolong bantuannya pakai cara penyelesaian. makasih banyak :)

A. TI1 = 10 log (I1/Io)
70 = 10 log (I1/10^-12)
7 = log (I1/10^-12)
10^7 = I1/10^-12
I1 = 10^7 x 10^-12
I1 = 10^-5 W/m²

B. TIn = TI1 + 10 log n
TIn = 70 + 10 log 100
TIn = 70 + 10 x 2
TIn = 70 + 20
TIn = 90 dB