Answer:
90 days.
Step-by-step explanation:
dy/dt = - 0.0032y
dy = -0.0032y dt
dy/y = -0.0032 dt
Integrating:
ln y = -0.0032t + c where c is some constant
y = e^(-0032t) + e^c
y = A e^(-0032t) where A is a constant.
At time 0 we can let y = 1 so in that case A = 1
When there is 0.75 of y left:
0.75 = e^-0032t
ln 0,75 = -0032 t
t = ln 0.75 / -0032
t = 90.
Answer:
9,12,15 i think
Step-by-step explanation:
Answer:
10
Step-by-step explanation:
or was it 11??
Answer:
C
Step-by-step explanation:
y-9=6 y-9=-6
+9 +9 +9 +9
y=15 y=3
