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zmey [24]
3 years ago
8

Of the 800 people at the concert, 42% of them are teenagers. How many teenagers are at the concert?

Mathematics
2 answers:
vovikov84 [41]3 years ago
7 0

Answer:

There are 336 teenagers in the concert. Please Mark me brainliest if I am correct thank you and have a nice day.

Step-by-step explanation:

Alex17521 [72]3 years ago
3 0

Answer: 336 teenagers

Step-by-step explanation: 42 percent = 21/50.

21/50 times 800 = 336!

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The​ half-life of​ carbon-14 is 5600 years. If a piece of charcoal made from the wood of a tree shows only 66​% of the​ carbon-1
xz_007 [3.2K]

The tree died about 3357 years ago.

Explanation:

The half life of carbon - 14 is given by

A(t)=A(0)e^{-kt}

where A(t)=0.5

A(0)=1

t=5600

Substituting these values in the above equation, we get,

0.5=1e^{-5600k}

Taking In on both sides of the equation, we get,

   In(0.5)=-5600k

      \frac{In(0.5)}{-5600} =k

0.00012377=k

Since, only 66% of Carbon - 14 remains after the time T.

Thus, we have,

0.66=1e^{-kT}

Taking In on both sides of the equation, we get,

  In(0.66)=-0.00012377 \ T

\frac{In(0.66)}{-0.00012377} =  T

        3357=T

Thus, the tree died about 3357 years ago.

6 0
3 years ago
Malachi has sticks that represent 4 different segment lengths: 3 inches, 4 inches, 5 inches, and 6 inches.
Dahasolnce [82]

Answer:

Create a triangle with the 3-, 4-, and 5-inch sticks and measure the angles to show that one angle is a right angle.

Step-by-step explanation:

6 0
2 years ago
IT'S WORTH 50 POINTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Slav-nsk [51]
They will be back together at:
10:20 am
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3 years ago
A tiger weighs 617 pounds.<br> Another tiger weighs 326 pounds.<br> How much do they weigh total?
irina [24]
943 pounds when you add them together
5 0
3 years ago
What is the answer to 3(x+4)+2(5x+2)
nalin [4]
<span>=<span><span><span><span><span>(3)</span><span>(x)</span></span>+<span><span>(3)</span><span>(4)</span></span></span>+<span><span>(2)</span><span>(<span>5x</span>)</span></span></span>+<span><span>(2)</span><span>(2)
</span></span></span></span><span>=<span><span><span><span>3x</span>+12</span>+<span>10x</span></span>+<span>4
</span></span></span><span>=<span><span><span><span>3x</span>+12</span>+<span>10x</span></span>+4
</span></span><span>=<span><span>(<span><span>3x</span>+<span>10x</span></span>)</span>+<span>(<span>12+4</span>)
</span></span></span><span>=<span><span>13x</span>+<span>16

Answer = </span></span></span><span>13x</span>+<span>16
(hope this helps)</span>
4 0
3 years ago
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