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andreyandreev [35.5K]
3 years ago
12

2x%___=256%___ X=______

Mathematics
1 answer:
kykrilka [37]3 years ago
3 0
(2x)/2= (256)/2
X=128
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56% of what number is 84
damaskus [11]
We set up a proportion: 84/?= 56/100

Cross multiply: 56*?= 84*100
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56% of 150 is 84.
7 0
3 years ago
A fossilized leaf contains 18% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as
Sati [7]

Answer: The age of the fossilized leaf is 13829 years.

Step-by-step explanation:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  

t = age of sample

a = let initial amount of the reactant = 100

a - x = amount left after decay process = \frac{18}{100}\times 100=18  

a) for completion of half life:  

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

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t=13829years

The age of the fossilized leaf is 13829 years.

7 0
3 years ago
SAVINGS ACCOUNT
yarga [219]

Answer:

$4000 was invested at 4%, 2500 was invested at 3%

Step-by-step explanation:

First and foremost the question has to be define.

Total amount raised is $6500

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Government Bond: 4% simple interest

Equation for amount invested at each rate:

(6500-x)0.03 + 0.04x = 235

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frosja888 [35]

Answer:

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cats - 39

Step-by-step explanation:

Let the number of dogs Ma Bernier have be represented with d

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cats = 3d

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d + 3d = 52

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divide both sides of the equation by 4

d = 13

She has 13 dogs

Cats = 3d

= 3 x 13 = 39

3 0
3 years ago
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