Answer:

Step-by-step explanation:

<h2>
Explanation:</h2><h2>
</h2>
Here we have the following expression:

What we need to do is to substitute
into our expression. Therefore:

Finally, when evaluating
into the expression the result is 4.
Answer:
Step-by-step explanation:
y = 15(1.35)x
(x/2 - 3) - (4x^2 + x - 4)
(x/2 - 3) - (16x + x - 4)
(1/2x - 3) - (17x - 4)
-16.5x - 1
I believe that is the correct answer.
For half lives

A=final amount
P=present amount
t=time in some units (this case it is days)
h=half life in days in th is case
so
given
we want 5% left
so A=5% of P or 5/100 of P or 1/20 of P or 0.05P
h=4.6
so

divide bth sides by P

take ln of both sides



divide both sides by


times both sides by 4.6

use your calculator
19.889t
so after about 20 days