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Anna71 [15]
3 years ago
12

What is the estimate of 8.354

Mathematics
1 answer:
MakcuM [25]3 years ago
8 0
It's 8 if you're doing ones but if you're doing tenths it's 8.4 and i
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3² x 3 x 3 x 3= <br><br> Simplified into exponential form
ruslelena [56]

Answer:

Step-by-step explanation:

3^{2} *3^{1}*3^{1}*3^{1}

because the bases are all the same.. just add the exponents

3^{2+1+1+1}

or

3^{5}

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Which of the following are statistical questions? Select all that apply.
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Help me solve this problem
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Step-by-step explanation:

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Which of the equations is proportional if y is a function of X?
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The half life of uranium-232 is 68.9 years. (show step by step)
dalvyx [7]

Answer:

1.) 8.09g ; 2) 206.7 years

Step-by-step explanation:

Given the following :

Half-life(t1/2) of Uranium-232 = 68.9 years

a) If you have a 100 gram sample, how much would be left after 250 years?

Initial quantity (No) = 100g

Time elapsed (t) = 250 years

Find the quantity of substance remaining (N(t))

Recall :

N(t) = No(0.5)^(t/t1/2)

N(250) = 100(0.5)^(250/68.9)

N(250) = 100(0.5)^3.6284470

N(250) = 100 × 0.0808590

= 8.0859045

= 8.09g

2) If you have a 100 gram sample, how long would it take for there to be 12.5 grams remaining?

Using the relation :

N / No = (1/2)^n

Where N = Amount of remaining or left

No = Original quantity

n = number of half-lifes

N = 12.5g ; No = 100g

12.5 / 100 = (1/2)^n

0.125 = (1/2)^n

Converting 0.125 to fraction

(1/8) = 1/2^n

8 = 2^n

2^3 = 2^n

n = 3

Recall ;

Number of half life's (n) = t / t1/2

t = time elapsed ; t1/2 = half life

3 = t / 68.9

t = 3 × 68.9

t = 206.7 years

7 0
3 years ago
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