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Olegator [25]
3 years ago
11

Element X decays radioactively with a half life of 11 minutes. If there are 300 grams of Element X, how long, to the nearest ten

th of a minute, would it take the element to decay to 99 grams?
Mathematics
1 answer:
notsponge [240]3 years ago
7 0

Answer:

17.6

Step-by-step explanation:

Y=a(.5)^t/h

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Solve for x. -0.65 + 0.45x = 5.4
FinnZ [79.3K]

Answer:

x = 13.444 ... (repeating decimal) or;

x = 13 4/9

Step-by-step explanation:

-0.65 + 0.45x = 5.4

First we will add 0.65 to each 'side' of the equation.

0.65 + (-0.65) + 0.45x = 0.65 + 5.4

        0.65 + (-0.65) = 0

        0.65 + 5.4 = 6.05

Input the numbers, and now the equation looks like this:

0 + 0.45x = 6.05

Remove the zero:

0.45x = 6.05

Divide each 'side' by 0.45.

0.45x ÷ 0.45 = 6.05 ÷ 0.45

        0.45x ÷ 0.45 = 1x = x

        6.05 ÷ 0.45 = 13.444 ... repeating decimal

Input the numbers, and now the equation looks like this:

x = 13.444 ... repeating decimal

We can also write this as:

x = 13 4/9 in fraction form

3 0
3 years ago
-<br> What are the odds of winning a game, if the probability of winning the game is 4/10
oksano4ka [1.4K]

Answer:

40%

Step-by-step explanation:

4/10 = 40/100

40/100 as a percentage is 40%

7 0
3 years ago
Combine equations<br> -5x - 9y = -2<br> 5x - 9y = 3
Sever21 [200]
The answer is -18y = 1 because the 5s cancel out
4 0
3 years ago
Alona has some wood cutouts of two different shapes - square and triangle. Each square cutout is 6 mm thick and each triangular
kobusy [5.1K]

Answer:

18

Step-by-step explanation:

Volume is a product of cross-sectional area and height and relresented as V=Ah where V is volume, A is cross-sectional area and h is height.

For the square, since each has a thickness of 6mm then for 24 of them the height will be 24*6=144 mm

Since the volume and cross sectional area of the triangle should be the same, then the height should also be the same.

Since for the triangle each has a thickness of 8mm then the number requred to achieve a height of 144 mm will be 144/8=18 stacks

7 0
4 years ago
How do you find the product for 2x0.8 and draw a quick picture
Artist 52 [7]
You find the product of 0.8x2 by doing this: (Image)

4 0
3 years ago
Read 2 more answers
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