8. 23,100 total fiction books
9. ????
Y = t*e^(-t/2)
y' = t' [e^(-t/2)] + t [e^(-t/2)]' = e^(-t/2) + t[e^(-t/2)][-1/2]=
y' = [e^(-t/2)] [1 - t/2] = (1/2)[e^(-t/2)] [2 - t] = - (1/2) [e^-t/2)] [t -2]
Answer:
im not sure if this is right
Step-by-step explanation:
demension 1: 9 X 10 demension 2: 10 x 4
-6p+8p=-16+4p
Combine like terms
2p=-16+4p
-4p -4p
-2p=-16
/-2 /-2
P=8
46 + 79 i think......................
