It would be 18.75 because if you put it into a mixed number then multiply by 5 you get 18.75
Step-by-step explanation:

Since,

Hence,


Since,

Hence,


The decimal is 3.5 and the percentage is 3.5%
In the original graph, R (0,3), S(3,3), T(4, -1) and Q(0, 1)
Reflecting it across y=-1, which is a horizontal line going through the point T, all the x coordinates stay the same,
the new confidantes are : R'(0, -5), S'(3, -5), T'(4, -1), Q(0', -3) (Notice; T stays where it is now, because it is right now the line y=-1)
Locate these new points, you have your graph.
4^3 = 64 so log_4(64) = 3 giving y = 3