We rewrite the equation:
y = y0 * e ^ (- 0.0002 * t)
In this equation:
I = represents the initial amount of the isotope
We have then:
89% of the isotope left:
0.89 * y0 = y0 * e ^ (- 0.0002 * t)
We clear the time:
e ^ (- 0.0002 * t) = 0.89
Ln (e ^ (- 0.0002 * t)) = Ln (0.89)
-0.0002 * t = Ln (0.89)
t = Ln (0.89) / (- 0.0002)
t = 582.6690813
round to the nearest year:
t = 583 years
Answer:
There will be 89% of the isotope left in about:
t = 583 years
Answer:
[(-15, 21), (-6, 12).(-1, 7)}
Step-by-step explanation:
we have
x+y=6
Find the values of y for XE (-15, -6, -1)
so
For x=-15
-15+y=6 --->y=21
therefore
a solution is the point (-15,21)
For x=-6
-6+y=6 --->y=12
therefore
a solution is the point (-6,12)
For x=-1
-1+y=6 --->y=7
therefore
a solution is the point (-1,7)
The set of ordered pairs that are solutions is
[(-15, 21), (-6, 12).(-1, 7)}
Money saved in 25 days = $3600.
Money saved in 50 days = $7200.
<u>Step-by-step explanation</u>:
Step 1 :
Kristy earns each day = $134
Step 2 :
she spends every day = $8 on breakfast + $12 on lunch.
Amount spent daily = $20
Step 3 :
Savings = money earned daily - money spent daily
= $134 - $20 = $114
∴The money saved per day is $144.
Step 4 :
Money saved in 25 days = 25144 = $3600.
Money saved in 50 days = 50144 = $7200.
wait a minute i will revisw this
Answer: Option D.
Step-by-step explanation: I did this.