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:
-8.05
Step-by-step explanation:
In order to solve for C you first have to subtract 17.6 from both sides.
2c=(6/4)-17.6
6/4 is 1.5
1.5-17.6=-16.1
2c=-16.1
c=-8.05
Answer 35$
Step-by-step explanation:
Suppose you have $20 in your bank account. You start saving $5 each
week. Your friend has $5 in his account and is saving $10 each week.
After how many weeks will you and your friend have the same amount
in your account? How much money will you have?
y=5x+20
Y=10x+5
5x+20=10x+5
20=5x+5
15=5x+5
15/5 =5/5x
x= 3 weeks
5.3 + 20 = y y=$ 35
15+20= 35
so your answer is 35$
HOPE THAT HELP MARK ME BRINLIYS
