Strontium-90 has a half-life of about 29 years. After 65 years, about how many grams of a 25-gram sample will remain?

Mathematics

1 answer:

konstantin123 [22]2 years ago

3 0

Answer:

Ending Amount = Beginning Amount / 2 ^ n

where 'n' = number of half-lives n = 65 / 29 = 2.2413793103

Ending Amount = 25 g / 2^2.2413793103

Ending Amount = 25 / 4.7284892286

Ending Amount = 5.2871009727 g = 5.29 g (rounded)

Step-by-step explanation:

You might be interested in

1,2,5,6,7,11 slope and y-intercept

enot [183]

I’m sorry I can’t help ypu

7 0

3 years ago

the amount of water in a bathtube as it drains can be modeled by this equation with y representing the number of gallons of wate

koban [17]

Since $y$ is representing the number of gallons of water in the tub, we need to replace $y$ with the number of gallons remaining in the tube to find the time. Fortunately, the problem is telling us just that: 17.8 gallons. The only thing left is replacing that value in the equation, and solve for $x$ to find the time:
$17.8=-7.3x+39.7$
$7.3x=21.9$
$x= \frac{21.9}{7.3}$
$x=3$

We can conclude that after 3 minutes <span>the tub will have 17.8 gallons of water remaining.</span>

4 0

2 years ago

Help me plzzzzzzz.thank you

ad-work [718]

ANSWER
M=(−3,72)

Find A midpoint calculator on the internet

8 0

3 years ago

A triangle has one angle of 120 degrees what must be true about the other two angles A- the sum of the two angles must be equal

Delvig [45]

Answer:

Step-by-step explanation:

Since all triangles' angles have a sum of 180 degrees, it can't be A, because that would make it 240 degrees. That leaves us with B and C. While B <em>could</em> be true, we don't know it for sure. Therefore, C is the correct answer because adding them should equal 60 degrees, which, adding them to the first angle (which was 120 degrees), would 180 degrees.

8 0

2 years ago

PLEASE HELP 45

Mamont248 [21]

Answer:I believe the answer is true but not 100% sure Hope this helped

3 0

3 years ago