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3 years ago

2x<8 need help please

Mathematics

1 answer:

uranmaximum [27]3 years ago

3 0

Answer:

x<4 .................. .......

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Sodium-24 has a half-life of 15 hours. how many grams of a 900 g sample will remain after 90 hours

raketka [301]

Answer: Option 'B' is correct.

Step-by-step explanation:

Let the initial concentration be

$N_0=900\ g$

Let concentration after t= 90 hours be N

Since we have given that Sodium-24 has a half life of 15 hours i.e.

$t_{\frac{1}{2}}=15$

So, According to question,

$\text{ Number of half lives }=\frac{t}{t_{\frac{1}{2}}}\\\\\text{ Number of half lives }=\frac{90}{15}\\\\\text{ Number of half lives }=6$

As we know that

$\frac{N}{N_0}=(\frac{1}{2})^n\\\\N=N_0\times (\frac{1}{2})^n\\\\N=900\times (\frac{1}{2})^6\\\\N=\frac{900}{64}\\\\N=14.0625\ g$

Hence, Option 'B' is correct.

4 0

4 years ago

Answer all questions plzz.. 2/2^2 3^4/3^4 3k^2/7k 7n^4 * 4n

Ilya [14]

Answer:

1. 1/2 or .5 (same thing)

2. 1

3. -4k

4. 28n^5

Step-by-step explanation:

2/2^2 → 2/4 = .5

3^4/3^4 → 81/81 = 1

3k^2/7k = -4k

7n^4 x 4n = 28n^5

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3 years ago

30% of the mass of an object is 24 kilograms. Use this fact to find: a 60% of the mass b 10% of the mass c 50% of the mass d the

Mademuasel [1]

Answer:

30% of the mass of an object is 24 kilograms. Use this fact to find: a 60% of the mass b 10% of the mass c 50% of the mass d the whole mass of the object

Step-by-step explanation:

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3 years ago

How can you write the number 1 as a power with base 2

liq [111]

Answer:

2x2=4it is 4

Step-by-step explanation:

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3 years ago

Dara has to solve 35 math problems for homework. She has completed 14 of them.what fraction of the problems does she have left t

RSB [31]

Answer: 3/5

Step-by-step explanation: thats your answer.

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3 years ago