Question

Can someone tell me how do I solve this. how is the result 2.40

we still have not learned log in school​

Answer 1

Explanation:

Properties used

• logₐ a = 1
• log aᵇ = b log a
• log ab = log a + log b

See the steps below

• - log (4*10⁻³) =
• - (log 4 + log 10⁻³) = (log 4 ≈ 0.6 rounded)
• - (0.6 - 3*log 10) =
• - (0.6 - 3*1) =
• - (0.6 - 3) =
• - (- 2.4) =
• 2.4