What is log7(49a) – log10(0.01)?

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Mathematics JAMB 1979

What is log7(49a) – log10(0.01)?

  • \(\frac{49^a}{100}\)
  • \(\frac{a}{2}\) + 2
  • 72a + 2
  • 2a + 2 checkmark
  • \(\frac{2a}{2}\)

The correct answer is: D

Explanation

log7(49a) - log10(0.01) = log7(72)a - log10100

log772a - log101 - log10 102

= 2a - 2

= 2a + a
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