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NISA [10]
3 years ago
8

An element with a mass of 680 grams decays by 27.7% per minute. To the nearest minute, how long will it be until there are 2 gra

ms of the element remaining?
Mathematics
1 answer:
kipiarov [429]3 years ago
3 0

Answer:

  3 minute    35.969420299997999 seconds

Step-by-step explanation:

Okay in simple words its 3 minute and 35 seconds or something.

Since we want to leave 2 grams ,

Amount to decay = 680-2

                             = 678g

Amount decayed per minute = 27.7 %

Amount decayed per minute ( in grams) = 188.36 g

Amount decayed per second ( in gram ) = 3.139333333g

Your required Ans =  678  /  3.139333333

                               = 215.9694203 seconds

                                i have converted them to minute in the title  : D

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A study has shown that the daily amount of milk produced by a dairy cow is
8090 [49]

Answer:

A

Step-by-step explanation:

this is more of a mind game.  Lots of words to throw you off.  Daily a cow produces a mean of 6.2 gallons (average of 6.2 gallons, meaning they already found the mean, "averaged" it out for you) with a deviation of .7 gallons ("give or take" .7 gallons).  On any given day (throw these words out) 68% of the cows (don't need this information to answer the question either, thrown in to confuse you) will produce an amount of milk within which of the following ranges?  Just subtract the deviation ("give or take number") .7 gallons from the mean (average (already determined)) 6.2 gallons which is 5.5 gallons THEN add the deviation ("give or take number") .7 gallons to the mean (average (already determined)) 6.2 gallons which is 6.9 gallons.  Your answer is A 5.5 gallons to 6.9 gallons.     You don't even have to go crazy on the math on this question you can rule them all out but A immediately with subtracting .7 from 6.2.  Mind games .... LOL sneaky.  

6 0
3 years ago
Eight friends started a business. They will wear either a baseball cap or a shirt imprinted with their logo while working. They
posledela

Answer:The system of equations to describe the situation are

c + y = 8

6c + 3y = 36

Step-by-step explanation:

Let c represent the number of shirts.

Let y represent the number of caps.

Eight friends started a business. They will wear either a baseball cap or a shirt imprinted with their logo while working. This means that

c + y = 8 - - - - - - - - - - -1

They want to spend exactly $36 on the shirts and caps. Shirts cost $6 each and caps cost $3 each. This means that

6c + 3y = 36 - - - - - - - - - - 2

4 0
3 years ago
What is 24^2? Use mental math.
AnnZ [28]

Answer:

576

Step-by-step explanation:

calculator

5 0
3 years ago
What is the sum of the geometric sequence -4, 24, -144, ... if there are 6 terms?
kondor19780726 [428]

Answer:

1556963

Step-by-step explanation:

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6 0
3 years ago
What’s the correct answer for this question?
Brut [27]

Answer:

C.

Step-by-step explanation:

First finding height using Pythagoras theorem

(H)²=(B)²+(P)²

8.2²=5.4²+P²

P² = 67.24 - 29.16

P² = 38.08

P = 6.2

Now

Volume of cone = (1/3)πr²h

= (1/3)(3.14)(5.4)²(6.2)

= (1/3)(567.9)

= 189.2 cm³

6 0
2 years ago
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