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zepelin [54]
2 years ago
9

The half-life of a radioactive kind of strontium is 10 hours. How much will be left after 40 hours, if you start with 80 grams o

f it?
Mathematics
1 answer:
inysia [295]2 years ago
6 0

The amount of strontium that will remain after 40 hours is 5 g

<h3>How to determine the number of half-lives </h3>
  • Half-life (t½) = 10 hours
  • Time (t) = 40 hours
  • Number of half-lives (n) =?

n = t / t½

n = 40 / 10

n = 4

<h3>How to determine the amount remaining </h3>
  • Original amount (N₀) = 80 g
  • Number of half-lives (n) = 4
  • Amount remaining (N) =?

N = N₀ / 2ⁿ

N = 80 / 2⁴

N = 80 / 16

N = 5 g

Learn more about half life:

brainly.com/question/26374513

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Joseph and Dwayne are both selling cookie dough for a fundraiser. Although Joseph has already sold 3 tubs, Dwayne hasn't sold an
ArbitrLikvidat [17]

Answer:The number of days it will take to sell the same amount of cookies is 3 and the number of tubs that will be sold is 27

Step-by-step explanation:

Let x represent the number of days it will take either of them to sell the same number of tubs.

Let y represent the total number of tubs that that Joseph will sell in x days.

Let z represent the total number of tubs that that Dwayne will sell in x days.

Joseph has already sold 3 tubs. If Joseph starts selling 8 tubs per day, it means that in x days, the number of tubs that he will sell will be

y = 8x + 3

Dwayne hasn't sold any yet. If Dwayne begins selling 9 tubs per day, it means that in x days, the number of tubs that he will sell will be

z = 9x

To determine the number of days it will take to sell the same amount of cookies, we will equate y to z. It becomes

8x + 3 = 9x

9x - 8x = 3

x = 3

The number of tubs that each will sell will be 9x = 9×3 = 27

3 0
3 years ago
Linda had 84 fliers to post around town. Last week, she posted 1/3 of them. This week, she posted 2/7 of the remaining fliers. H
Jobisdone [24]

The remaining number of flires that Linda still not posted is 40.

According to the given question.

The total number of fliers Linda have = 84

Fraction of fliers Linda posted = 1/3

And, fraction of fliers Linda posted second time from the remaning fliers = 2/7

Now,

1/3 of 84 fliers = 1/3 × 84 = 28

So, the number of fliers are left with Linda after first posting = 84 - 28 = 56

Again she posted 2/7 fliers. The number of flires Linda posted second time is given by

⇒ 2/7 × 56 = 16

Thereore,  the number of fliers that Lindna still not posted  = 56 - 16 = 40

Hence, Linda still not posted 40 fliers.

Find out more information about fraction and remaining numbers here:

brainly.com/question/2254581

#SPJ4

4 0
11 months ago
Which of the following functions is graphed below.
Valentin [98]

Answer: Option A

y=\left \{ {{x^2 +2;\ \ x

Step-by-step explanation:

In the graph we have a piecewise function composed of a parabola and a line.

The parabola has the vertex in the point (0, 2) and cuts the y-axis in y = 2.

The equation of this parabola is y = x ^ 2 +2

Then we have an equation liney = -x + 2&#10;

Note that the interval in which the parabola is defined is from -∞ to x = 1. Note that the parabola does not include the point x = 1 because it is marked with an empty circle " о ."

(this is x< 1)

Then the equation of the line goes from x = 1 to ∞ . In this case, the line includes x = 1 because the point at the end of the line is represented by a full circle .

(this is x\geq 1)

Then the function is:

y=\left \{ {{x^2 +2;\ \ x

7 0
3 years ago
Can someone help me with this math homework please!
Korolek [52]

Answer:

it is the second statement x⇒∞ Y⇒ ∞

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
1. if a = 16 and b= 12, find c
klasskru [66]

Answer:

20

Step-by-step explanation:

The pythagorean theorem states that

a^2+b^2=c^2

So 16^2 + 12^2 = c^2\\256+144 = c^2\\400 = c^2

You would then do

400 = c^2\\\sqrt{400} = c

Because a square root is the opposite of a square.

\sqrt{400} = 20

because 20 * 20 = 400

7 0
3 years ago
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