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3 years ago

Dan had forty-three dimes and forty-one nickels in his bank. His dad borrowed nineteen nickels from Dan.

Mathematics

1 answer:

lozanna [386]3 years ago

7 0

41-19 is 22 so he has 22 nickels. The amount of dimes is put in there to distract you. Just ignore those! :)

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The element plutonium-239 is highly radioactive. Nuclear reactors

Dominik [7]

Answer:

$2.84\cdot 10^{-5} y^{-1}$

Step-by-step explanation:

The decay rate of a radioactive isotope (also called activity of the isotope) is given by:

$r=k N$

where

r is the decay rate

k is the decay constant

N is the number of nuclei in the radioactive sample

The decay constant of a radioactive isotope is also related to the half-life of the isotope by the formula

$k=\frac{ln2}{t_{1/2}}$

where

$t_{1/2}$ is the half-life of the isotope, which is the time taken for the sample to halve, compared to its initial amount

In this problem, the half-life of plutioniun-239 is

$t_{1/2}=24,360 y$

Therefore, the k-factor (decay constant) is:

$k=\frac{ln 2}{24,360}=2.84\cdot 10^{-5} y^{-1}$

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3 years ago

What is the value of x? 34 56 68 79

miskamm [114]

Answer:

The answerer to this question is a 34

Step-by-step explanation:

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4 years ago

A math test has a total of 20 problems some problems are worth two points and some are worth three points the whole test is wort

kari74 [83]

Answer:

There were 12 questions worth 3 points

Step-by-step explanation:

Let x = 2 point questions

let y = 3 point questions

What we know:

x + y = 20 (questions)

so to solve for x we tweak our equation:

x = 20 - y

Now we need an equation to explain out question set up:

2x (2 point questions)

3y (2 point questions)

2x + 3y = 52 (52 being our total possible points)

Now we take our x = 20 - y and substitute it into our 2x + 3y = 52 equation.

2(20 - y) + 3y = 52

Next we distribute the 2 through the parenthesis:

40 - 2y + 3y = 52

Now, gather the like terms:

40 + y = 52

Subtract 40 from both sides:

y = 12

Revisit x + y = 20 and sub 12 in for Y:

x + 12 = 20

x = 8

8 2-point questions would be 16 points

12 3-point questions would be 36 points

16 + 36 = 52 (which matches the max value of our test)

4 0

4 years ago

11. If A, B, and C are any three sets, then show that, (a (BA)U(C-A) = (BUc)-A

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2 years ago

Read 2 more answers

HELP PLEASE HELP HELP THIS HOMEWORK IS LATE I NEED HELP ILL MARK BRAINLIEST!!! I THINK THIS IS 26 POINTS OR SUM IDK BUT HELP

Inga [223]

Answer: Elevator A

Step-by-step explanation:

30 ÷ 4 =7.2 floors per 6 sec

30 ÷ 3 = 10 floors per 5 scc

5 0

3 years ago