If log10 7 equals a, then log10 1 equals:
A. - (1 + a)
B. (1 + a)-1
C. a/10
D. 1/10a
Answer:A
If log10 7 equals a, then log10 1 equals:
A. - (1 + a) B. (1 + a)-1 C. a/10 D. 1/10a
Explanation: log10 1/70 = log10 1 - log10 70 = - log10 (7 x 10) = - (log10 7 + log10 10) = - (a + 1).