Hello, daniella!
You're expected to know that is equivalent to
. . and the Base-change formula: .
How do i use the "change of base" formula to solve:
"Change of Base" formula: .
1a) We have: . . . . which is equivalent to: .
Change-of-base: .
Therefore: .
2d) We have: . . . . which is equivalent to: .
Change-of-base: .
Therefore: .