Answer:
20+20
Step-by-step explanation:
1800
there are 60 seconds in a minute
so, 30 * 60 = 1800
-7
given f(x)=4x+k
therfore, f(2)=4*2+k
we know that f(2) =1
so, 4*2+k=1
8+k=1
k=1-8
k=-7
It's D