Question

1.Considerando log10 2 = 0,3010 e log10 3 = 0,4770, então qual será o valor de log10 450 será igual a:
A. 45
B. 0,667
C. 2,500
D. 2,653
E. 2,654

Answer 1

**log 2 = 0,301
**log 3 = 0,477
**log 10 = 1

log 450
= log 900/2
= log (9 × 100) / 2
= (log 9 + log 100) - log 2
= (log3^2 + log10^2) - log 2
= (2log 3 + 2log 10) - log 2
= (2×0,477 + 2) - 0,301
= 2,954 - 0,301
= 2,653

R: D) 2,653