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3 years ago

PLEASE HELP!!! PLEASE SHOW ALL OF YOUR WORK!!!

Mathematics

2 answers:

Elza [17]3 years ago

8 0

The answer is c bc I just know

Korolek [52]3 years ago

5 0

Your Answer: C

Why? It’s simple and easy

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The cat has gone 7 /16

rjkz [21]

There is no explanation for this problem, as it does not describe how the distance to the gate is related to the distance across the yard.

If we make the assumption that the cat is headed directly to the gate, which is the full distance across the yard, this question is asking you to subtract the fraction 7/16 from 1, where 1 represents the full distance across the yard. Of course, the result is (16/16 - 7/16) = 9/16 of the distance across the yard.

3 0

3 years ago

Brainliest? YES brainliest! Give me the answer in minutes and you get it.

NikAS [45]

Answer:

The answer is c. 4______

4 0

4 years ago

Read 2 more answers

What is the answer ? 640 240 300 and 320

patriot [66]

Step-by-step explanation:

10±10±30±30=80

8round = 80×8=640

<h2>don't forget me to follow</h2>

8 0

3 years ago

Read 2 more answers

Absolute value of (0, -4/5)

Crazy boy [7]

To answer this question, we need to know what absolute value is in the first place. ANSWERS ARE AT THE BOTTOM.

Absolute value represents how far something is from 0 in a number line.

For example, lets take 4.

4 is 4 units away from 0 on the number line, so the absolute value of 4 is 4.

Now lets look at another example, -4. -4 is also 4 units away from 0, just in the other direction. However, when calculating absolute value, we do not care about the direction. Therfore, the absolute value of -4 is also 4.

Now let's look at your problem.

You want the absolute value of 0 and -4/5

Following the same principle above about the distance from 0, here are your answers:

Absolute value of 0: 0

Absolute value of -4/5: 4/5

8 0

2 years ago

Radioactive Decay

SpyIntel [72]

Answer:

Percentage of (226Ra) after 900 years is 68%

Step-by-step explanation:

Let P(t) be the amount of (226Ra) present at any time t

Half life of (226 Ra) = 1599 years

If P₀ is initial amount of (226 Ra) then after 1599 years

P(1599)=P₀/2

Decay i amount of radioactive substance is related to time t as

$\frac{dP}{dt}=kP(t)\\\\\frac{1}{P}\,dP=kdt\\\\Integrating\,\, both\,\,sides\\\\ln|P|=kt+c\\\\P(t)=Ce^{kt}\\\\at \,\, t=0\,\, P(0)=P_{o}\\\\P(0)=Ce^{k0}\\\\P_{o}=C\\\\then\\\\P(t)=P_{o}e^{kt}$

To find value of k

$at\,\, t=1599\,years\\\\P(1599)=\frac{P_{o}}{2}\\\\then\\\\\frac{P_{o}}{2} =P_{o}e^{k(1599)}\\\\\frac{1}{2} =e^{k(1599)}\\\\ln|\frac{1}{2}|=k(1599)\\\\k=\frac{ln|\frac{1}{2}|}{1599}=-4.3\times 10^{-3}\\\\\implies P(t)=P_{o}e^{-4.3\times 10^{-3}t}\\\\at\,\, t=900 \\\\P(900)=P_{o}e^{-4.3\times 10^{-3}(900)}\\\\P(900)=0.68P_{o}$

Percentage of radioactive element is:

Amount after 900 years $=\frac{P(900)}{P_{o}}\times 100\\\\=\frac{0.68P_{o}}{P_{o}}\times 100\%\\\\=68\%$

3 0

3 years ago