Answer:
The percentage rate of decay per year is of 3.25%.
The function showing the mass of the sample remaining after t is
Step-by-step explanation:
Equation for decay of substance:
The equation that models the amount of a decaying substance after t years is given by:
In which A(0) is the initial amount and r is the decay rate, as a decimal.
Every 21 years, its mass decreases by half.
This means that . We use this to find r, the percentage rate of decay per year.
The percentage rate of decay per year is of 3.25%.
Given that the initial mass of a sample of Element X is 80 grams.
This means that
The equation is:
The function showing the mass of the sample remaining after t is
Answer:
formula = feet / 5280
=> 32750 / 5280
=> 6.20265.......
When rounded to the nearest tenth we get,
6.20 or simply 6.20
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Hi! :)
In this case, we have to square both sides of the equation. When we square the left side, we will get x^2 + 81, because square root squared denies one another, and for the right side, we have to square the binomial, like this:
(x+10)^2 = x^2 + 20x + 100
So the correct answer is the last one : x^2 + 81 = x^2 + 20x + 100.
Hope this helps!
The answer of that would be 60 because since 25 percent goes into 100 percent 4 times that means that you would multiply 15 by 4 to get 60
Answer:
6x-3.
Step-by-step explanation:
-3(-2x+1) : distribute the -3 to "-2x" and "1."
6x-3: this is the answer.