Answer:554.64 s
Step-by-step explanation:78/250= e^(-0.0021t)
0.312=e^(-0.0021t)
ln0.312= -0.0021t
t= 554.64 s
Answer:

Step-by-step explanation:
Set an equation:

Combine like terms:

Add 5 to both sides:

Divide both sides by 2:


The value of CE = 18.3
According to the statement
Here we have given the value of tangents AE = 8 and BC = 3
we have to find the value of CE and
It is given that AE is the tangent to the circle.
Now we make a equation to find the CE then
(8)^2 = 3(x+3)
In this equation the value of AE is 8. and
In this x is the value of CE and BC have value 3.
And the total value of BE becomes the 3(x+3) and 3 is the parts by which BE is formed.
Then solve the equation
64= 3x +9
3x = 64-9
x = 18.3
So, The value of CE = 18.3
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Answer:
x<-21
Step-by-step explanation:
x/7<-3
x<-21