F'(x) = 7sec x . tan x - 5.
Parallel is when the lines go the same direction and never touch whereas perpendicular lines are when the lines cross each other so the they are like a plus sign with all 90 degree angles. Hope i helped.
Y=2000*

2200=2000*


<span>
so,
y at t=8 is 2000*(</span><span>

)^8
y = 2000(22/20)^2=2000*1.21=</span><span>2420 thats the answer i hope.</span>