Step-by-step explanation:
a. log 2 3/7
= log 2 ³ ÷ log 2 ⁷
= log 2 ³ - log 2 ⁷
= 1.585 - 2.807
= -1.222
b. log 2 ¹⁸
= log 2 ⁷ × log 2 ³ - log 2 ³
= log 2 ⁷ + log 2 ³ - log 2 ³
= 2.807 + 1.585 - 1.585
=2.807
c. log 2 ⁴⁹
= log 2 ⁷ × log 2 ⁷
= log 2 ⁷ + log 2 ⁷
= 2.807 + 2.807
= 5.614
