Alright so
5^4m = 5^12
cancel the bases
4m=12
divide by 4
m=3
Check the picture below.
make sure your calculator is in Degree mode.
29% 187050/145000 = 1.29 = 29%
To simplify things, one could just use differentiation with exponents.
y= 1/(p +ke^p)= (p + ke^p)^-1
dp/dy = -1 - ke^p
The slope of your line CD is 4 because it goes up to 8/2 ( rise/run)