3 years ago

PLEASE HELP!!!

Mathematics

1 answer:

mrs_skeptik [129]3 years ago

4 0

16 Dimes and 21 Nickels

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Question: Carbon-11 has a half-life of about 20 minutes. If we start with 200 grams, how

irakobra [83]

Answer:

C). 0.39 grams

Step-by-step explanation:

First find how many half-lifes are in 3 hours:

3 hours ÷ 20 minutes = 9 half-lifes

Find the total left:

0.5^9*200 ≈ 0.39

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3 years ago

What is 420 + 69? Pleaseeeee

Verizon [17]

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If y is proportional to x and y = -15 when x = -20, what is the value of x when y = 12?

Alex

When y=-15, x=-20. So subtract x from y, you will get that y= 0 and x=-5. Add 12 to both and you have your answer, x=7 and y=12

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3 years ago

What is the length of BC ?<br>

galben [10]

The answer is c.

Since a^2+b^2=c^2, b^2=c^2-a^2 thus,
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2 years ago

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PLEASE HELP ME OUT..........

Vlad1618 [11]

Here is your answer

$\bold{x=12}$

REASON:

$Concept used$ : The opposite sides of a parallelogram are equal.

So, in above given figure

$3x+7=5x-17$ (measures of opposite sides)

$5x-3x= 17+7$

$2x= 24$

$x= 24/2$

$x= 12$

HOPE IT IS USEFUL

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3 years ago

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