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pychu [463]
3 years ago
13

Which number sentence is true?A.-1.5 + (-0.5) = 2.0B.2.5 + (-1.5) = 1.0C.-1.5 + (-0.5) = -1.0D.-2.5 + 3.5 = -1.0

Mathematics
1 answer:
Anni [7]3 years ago
4 0

Answer: B

Step-by-step explanation: the other ones are wrong.

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Find the solution set.<br><br> |x| = -16<br><br> { }<br> {-4, 4}<br> {-16, 16}<br> {-32, 32}
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This an { } solution  because the absolute value is always a positive number unless there is a negative sign in front of the brackets.  

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3 years ago
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Strontium-90 has a half-life of 28.8 years. If you start with a 300-gram sample of strontium-90,
Kazeer [188]

Answer:  2.66 × 10⁻¹³

<u>Step-by-step explanation:</u>

First, use the decay formula   A=A_oe^{kt}   where

  • A is the final amount (amount left)
  • A₀ is the initial amount (amount you started with)
  • k is the rate of decay (you need to solve for this)
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Given:

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150=300e^{28.8k}\\\\0.5=e^{28.8k}\\\\ln(0.5)=ln(e^{28.8k})\\\\ln(0.5)=28.8k\\\\\\\dfrac{ln(0.5)}{28.8}=k\\\\\\\large\boxed{-0.0240676=k}\\

Next, input the k-value and the new t-value to solve for A.

  • A = unknown
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  • k = -0.0240676
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A=300e^{1440(-.0240676)}\\\\\large\boxed{A=2.66\times 10^{-13}}\\

5 0
4 years ago
These triangles are similar.<br> True<br> Or<br> False
iren2701 [21]

Answer:

<u><em>True</em></u> because they both are triangles, they both have tree side but one is just smaller than the other.

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I just need help with number 2, thank you
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It represents the thing the avadocate needs to be muiltiplied by

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dezoksy [38]

Answer: $7.95+$1t ?

Step-by-step explanation:

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3 years ago
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