Answer:
x=2.4650
Step-by-step explanation:
I assume that you mean 
so let s use the ln() function

so x = ln(15)/ln(3)
x = 2.4650
It would be 455 inches because you divide 5/2 and it is 2.5 then you multiply it by 182 which is 455
78.5/100 as a decimal is just 0.78.5 and as a percent it is 78.5 %
I'm pretty sure it should be 2h+3