How long does it take for an investment to triple if it has an annual interest rate of 5.3 %
compounded continuously?

wait this depends wether emily and zach how they are thinking.

yes they are the same.

josh is incorrect

x= 7 and x= -1

step 2 is wrong and honestly first step is not needed, you just need to figure out the factors

i know its wrong because if you plug in the solutions josh found, they do not work (in the original equation)

x^2 -6x -7 = 0

(x-7) (x+1) = 0

x-7=0 x+1=0

x= 7 x= -1