Answer:
It will take 25.6 years for the mass of the sample to reach 400 grams.
Step-by-step explanation:
Element X is a radioactive isotope such that every 25 years, its mass decreases by half.
This means that the amount of the substance after t years can be modeled by a function in the following format:
In which A(0) is the initial amount.
Initial mass of a sample of Element X is 910 grams.
This means that
So
How long would it be until the mass of the sample reached 400 grams?
This is t for which
So
It will take 25.6 years for the mass of the sample to reach 400 grams.
Answer:
It does = 20 you're correct :)
Step-by-step explanation:
Answer:
90
Step-by-step explanation:
The opposite of the number a divided by the number
Answer:
After 12 minutes they will be 4 miles apart.
Step-by-step explanation:
Since they are intersect in right angle, the distance between them is the hypotenuse of the triangle formed by them with intersection.
A train is 10 miles from the intersection at the same moment that a car is 6 miles from the intersection.Both are traveling at 30 mph.
Let the time when distance between them is 4 miles be t.
Distance to intersection for train = 10 - 30 t
Distance to intersection for car = 6 - 30 t
We know that hypotenuse is 4 miles that is
Consider the smallest time, t = 0.2 hr = 12 minutes
After 12 minutes they will be 4 miles apart.