Which of the following could be the first step in solving the equation below? 5x = 21
A. 5* = 5/21
OB. 5.5* = 5•21
C. log 5* = 21
D. log 5x = log 21

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30