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soldi70 [24.7K]
3 years ago
11

2x -3y=8 solve for y

Mathematics
1 answer:
brilliants [131]3 years ago
5 0
2x-3y=8\ \ \ \ \ \ |subtract\ 2x\\\\-3y=8-2x\ \ \ \ \ \ \ \ \ |:-3\\\\y=\frac{8-2x}{-3}
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You have 42,784 grams of a radioactive kind of curium. If its half-life is 18 years, how much will be left after 72 years?
s344n2d4d5 [400]

Answer:

2,674.14 g

Step-by-step explanation:

Recall that the formula for radioactive decay is

N = N₀ e^(-λt)

where,

N is the amount left at time t

N₀ is the initial amount when t=0, (given as 42,784 g)

λ = coefficient of radioactive decay

  = 0.693 ÷ Half Life

  = 0.693 ÷ 18

  = 0.0385

t = time elapsed (given as 72 years)

e = exponential constant ( approx 2.7183)

If we substitute these into our equation:

N = N₀ e^(-λt)

= (42,787) (2.7183)^[(-0.0385)(72)]

= (42,787) (2.7183)^(-2.7726)

=  (42,787) (0.0625)

= 2,674.14 g

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3 years ago
How many digits are there in the smallest sequence of repeating digits in the decimal equivalent of 5/9
mestny [16]

Answer:

1

Step-by-step explanation:

5/9 = 0.5555555

The smallest sequence of repeating digits in the decimal equivalent of 5/9

0.5

0.5 + 0.05

0.5 + 0.05 + 0.005

0.5 + 0.05 + 0.005 + 0.0005

Hence, the number of digit in the smallest sequence of repeating decimal is 1

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3 years ago
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Answer:

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3241004551 [841]

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9 > 4x

4x<9

x<4/9


(-∞, 4/9)

7 0
3 years ago
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