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3 years ago

Is the expression 9(−4x−3) equivalent to the expression −36x−27.?

Mathematics

2 answers:

LekaFEV [45]3 years ago

5 0

Answer:

No they are not equivilant. −36x−27 = 972 & 9(−4x−3) = 108.

Step-by-step explanation:

Maksim231197 [3]3 years ago

4 0

Answer:

NO THERE NOT

Step-by-step explanation:

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FromTheMoon [43]

Answer:

Step-by-step explanation:

10/7 x 9/8 = 90/56 = 45/28.

7/9 x 8/10 = 56/90 = 28/45

If you want to multiply these, the answer is (28*45) / 28/45) = 1.

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4 years ago

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drek231 [11]

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3 years ago

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Tamiku [17]

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3 years ago

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trapecia [35]

Answer:

option A

Step-by-step explanation:

given,

sample of tritium, ³H

$t_{1/2} = 12.32 years$

contents present of ³H = 5.25 mol

content of ³He = 6.35 mol

reaction

$^3H\rightarrow \ ^3He$

A₀ is the initial concentration

At is the concentration after time t

A₀ = 5.25 + 6.35 = 11.6 mol

At = 5.25

now,

$k = \dfrac{0.693}{t_{1/2}}$

$k = \dfrac{0.693}{12.32}$

k = 0.0563 /year

$ln(\dfrac{A_o}{A_t}) = k t$

$t = \dfrac{1}{k} ln(\dfrac{A_o}{A_t})$

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t = 14.1 yr

hence, the correct answer is option A

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3 years ago