16=3(4)^x-11 is what ?

x = log4(9)

Step-by-step explanation:

16=3(4)^x-11

Add 11 to each side

16+11 = 3(4)^x-11+11

27 = 3 (4) ^x

Divide each side by 3

27/3 =  3/3 (4) ^x

9 = 4^x

We know a = b^c   then c = logb(a)

x = log4(9)

x = 1.584962500

D (60 feet above sea level)

Step-by-step explanation:

Because the question says he is 60 feet above sea level, and one of the answers is 60 feet above sea level.