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lakkis [162]
3 years ago
6

Which phrase best describes a period on the periodic table?

SAT
1 answer:
dybincka [34]3 years ago
8 0

The phrase which best describes a period on the periodic table is: a row of elements

Periodic table can be defined as an organized tabular arrangement of all the chemical elements arranged in order of increasing atomic number or number of protons, especially in rows.

On a related note, chemical elements with the same number of valence electrons are found in the same column of the periodic table.  

In conclusion, the rows of a periodic table are referred to as periods while the columns are referred to as groups.

Read more: brainly.com/question/24441368

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A grocery store has two recycling machines
Thepotemich [5.8K]

Answer is 112%

kinda skeptical about my answer but i am going to give it my best shot, sorry if i get it wrong.

In percent-type questions I always go by this formula:

not a %                            %

original number       :     100%

new number            :      new %

original number × new %  =  new number × 100%

here, the original numbers are 240 and 180 and the new % is +30% and -10% now let plastic be P and metal be M and let's elaborate this a bit further

plastic:

the first recycling machine took in 240  plastic bottles while the second took in 30% <u>more</u> plastic bottles, what we have to do here is to find out how much bottles the second machine took in as a form of integer, which is the new number; let that new number be X, let's plug this in the formula

240:100+30\\X:130 \\

notice: 130 is the new %

240*130 = 100X\\31200 = 100X\\312=X

the second machine took in 312 plastic bottles, let's save this answer for later

metal:

the first recycling machine took in 180 metal cans while the second took in 10% <u>less</u> plastic bottles, we do the same thing and find the new number, this time let it be Y:

180:100-10\\Y=90

90 is the new % here; also, notice how sometimes you either add or subtract percents, depending on what the problem demands.

180*90=100Y\\16200=100Y\\162=Y

Now we can conclude that the first recycling machine took in 240  plastic bottles and 180 metal cans and the second took in 312 plastic bottles and 162 metal cans.

here comes the hardest bit to apprehend and the final part of this problem, "the second machine recycled what percent (%) more items than the first?"

in other words, how much percent did the second machine recycle more.

to find that percent, first we need to add the plastic and metal "items" of both machines individually and turn them into percents: let the first machine be A and second machine be B:

A: 240+180=420

B: 312+162=474

again, using the same formula to find the new percent, let that percent be Z; plugging both A and B respectively:

420:100\\474:Z

420Z=474*100\\420Z=47400\\Z= 112.857≈ 112% more items than the first

now if you check the rounded up 112 and plug it back in to make sure of your answer: 420Z=47400 you end up getting 47040, since it's rounded up, but when you plug the full 112.857 you get 47399.94, closest to 47400. Tip: when you plug in any value for check up, don't use the rounded up one.

At last, those steps are actually fast, especially with that formula it's so important. the explanation seems intimidating so read it slowly and take your time. if you have any other questions, feel free to ask. also, let me know if you know a faster method to solve this question. <3

4 0
3 years ago
At the end of may, janet told sam that she has read 10 books this year and reads 2 books each month. Sam wants to catch up to ja
mylen [45]

Answer:

Please upload photo of question and graph so I can offer help

Explanation:

6 0
2 years ago
Read 2 more answers
Which statement is always true when describing sex-linked inheritance?.
klio [65]

Answer:

The alleles are found on the X or Y chromosome.

7 0
3 years ago
William julius wilson believes the cause of the emergence of an urban underclass is.
lapo4ka [179]

William Julius Wilson is known to be a popular man in history.  William Julius Wilson believes the cause of the emergence of an urban underclass is  economic and social structural deficits in society.

William Julius Wilson was known to be born December 20, 1935. He was a famous American sociologist.  He stated the importance of neighborhood effects and also showed how small employment opportunities and weakened institutional resources influenced poverty within American inner-city neighborhoods.

The underclass is known to be a collection of identifying traits, such as high rate of joblessness, single parents births etc.

See full question below

William Julius Wilson believes the cause of the emergence of an urban underclass is

a. the "culture of poverty."

b. prejudice and racism.

c. economic and social structural deficits in society.

d. too much immigration from some areas.

6 0
2 years ago
How does the troposphere differ from the stratosphere?
aksik [14]

Hi Daralava,

How does the troposphere differ from the stratosphere?

There are 2 major difference between the troposphere and the stratosphere, which is that the stratosphere is higher located than the troposphere, also the stratosphere is also warmer becase it receives more solar radiation the the troposphere.

4 0
3 years ago
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