Answer:
see explanation
Explanation:
using the rules of logarithms
• loga + logb = log(ab)
• loga - logb = log (
)
• log
= nlogx
(a)
5 +
3 =
(5 × 3) =
15
(b)
4 -
? =
(
) ← with a = 4 and b = 7 , then
4 -
7 =

(c)
81 = 4
?
note that 81 =
, then
81 =
= 4
3