6) b(iii) so it's like finding an asymptote you have to see what it approaches as e^-0.05t approaches infinity
so if you start sticking big numbers, 100, 1000, 1000000 etc you'll see it = 0 therefore p = 150 + 300(0) = 150
7) a(ii) need to do sum of the roots so alpha + beta and from part (i)...