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kaheart [24]
3 years ago
14

Jen can run a mile in 8 minutes. Which is the most reasonable time for her to run a 10-km race: 1.6min, 5 min, 50 min, or 500 mi

n?
Mathematics
1 answer:
just olya [345]3 years ago
7 0

Answer:500

Step-by-step explanation:

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A rock outcrop was found to have 95.82% of its parent U- 238 isotope remaining. Approximate the age of the outcrop. The half-lif
mixer [17]

Answer:

A) 277 million years

Step-by-step explanation:

Here, decay of U-238 is first order reaction. (since most of the nuclear decays are first order).

so, the equation t = \frac{1}{k} × ln(\frac{A(0)}{A})

where, t = time from start of reaction

           k = reaction constant

           A(0) = initial concentration; A = present concentration.

     ⇒ 4.5 billion = 4500 million years = \frac{1}{k}× ln2.

Now, given 95.82% of parent U-238 isotope is left.

⇒ t = \frac{1}{k} × ln(\frac{A(0)}{A})

  t = \frac{4500}{ln2} × ln(\frac{100}{95.82})

⇒ t ≅ 277 million years.

5 0
3 years ago
After 4 years eldi will be three times the age he had 10 years ago. Using algebra find the age of eldi
Setler [38]

Suppose that Eldi has x years old now :

x + 4 = 3 × ( x - 10 )

x + 4 = 3x - 30

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x + 4 + 30 = 3x - 30 + 30

x + 34 = 3x

Subtract both sides x

x - x + 34 = 3x - x

34 = 2x

2x = 34

Divide both sides by 2

2x ÷ 2 =34 ÷ 2

x = 17

_____________________________

Thus Eldi is 17 .

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3 years ago
Simplify 36n^7p^5 over 9n^4p
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A girrafe runs at a rate of 32 miles per hour. Which equation models the situation?
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Answer:A girrafe runs at a rate of 32 miles per hour. Which equation models the situation?

Step-by-step explanation:

4 0
3 years ago
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