Rewrite $\log_416$log416 in terms of base $10$10 logarithms.
Rewrite $\log_23$log23 in terms of base $10$10 logarithms.
Rewrite $\log_320$log320 in terms of base $4$4 logarithms.
Rewrite $\log_30.9$log30.9 in terms of base $10$10 logarithms.