I already answered it on one of your posts with the same question, but here I'll tell you again :)
<span>Okay so first set up the equation(s) for this situation. In this case, you need two equations:
B=3/4A (In which B= Benjamin and A=Ann)
S=2B (In which S= Siti and B= Benjamin)
Now first solve for the first equation where you can plug in A for 35kg:
B=3/A
B=3/4*35
B=26.25
Now you can use that value and use it for the second equation. Plug in B with 26.25:
S=2B
S=2*26.25
S=52.5
So Siti has a mass of 52.5 kg</span>
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
The dimensions of the rectangular plot of land that sits on a riverbank is 32 m by 9 m or 18 m by 16 m.
What is an equation?
An equation is an expression that shows the relationship between two or more numbers and variables.
An independent variable is a variable that does not depend on any other variable for its value while a dependent variable is a variable that depends on other variable.
Let x represent the length and y represent the width. Hence:
x + 2y = 50
x = 50 - 2y
Also:
xy = 288
(50 - 2y)y = 288
y = 9; and y = 16
x = 32; and x = 18
The dimensions of the rectangular plot of land that sits on a riverbank is 32 m by 9 m or 18 m by 16 m.
Find out more on equation at: brainly.com/question/2972832
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25 * 5 = 25 + 25 + 25 + 25 + 25 = 175
Answer:
$528.12
Step-by-step explanation:
499-10
489×1.08= 528.12