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sasho [114]
2 years ago
9

If 2 cars traveling towards one another are 100 miles apart and car A is traveling at 55 miles/hour, while car B is traveling at

60 miles/hour, which time is closest to when they meet if it is 2:00 pm now?
SAT
1 answer:
Pepsi [2]2 years ago
7 0

Answer:

Explanation:

The time when they meet is t in hours

The general formula for both cars  is d = r*t

t is unknown

r1 = 55 mph

r2 = 60 mph

60 mph * t  + 55 mph*t = 100 miles

t * (60 mph + 55 mph) = 100 miles

t * 115 = 100 miles

t = 100 miles / 115 mph

t = 0.8696 hours

1 hour has 60 minutes

0.8696 hour = x

x = 0.8696 hours * 60

x = 52 minutes  and 10 seconds

They will meet at 2:52:10

You have to give answers to get the time to agree.

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Georgia’s scores in six subjects are 89, 75, 92, 68, 78, 75, and 80. If she finds a single value that summarizes all the values
Allushta [10]
Hey there! :)

Your answer is mean
_____________________________________________________________

Mean is the average value of the data set.
Mode is the number that appears the most
Range is the difference between the greatest value and the lowest value in a data set.

Finding the mode is pretty useless because you can't do much with the score that you got the most.

Range isn't that helpful because it's the difference between your best and worst score.

Mean is best for summarizing because you have 1 number that's the average of the whole data set.
______________________________________________________________

Therefore, the answer is mean

Hope this helps :)
7 0
2 years ago
How can scientists ensure that their results are reliable? check all that apply. by making multiple observations by repeating tr
Neko [114]

The scientists ensure that their results are reliable by repeating trials.

Given that scientists ensure that their results are reliable.

We are required to tell the way how scientists ensure that their results are reliable.

Reliability is basically defined as the probability that a product, system, or service will perform its intended function adequately for a specified period of time, or will operate in a defined environment without failure.

Reliability increases from repeating trials.It is like vaccines. Firstly the trials to be made on small number of persons, then the numbers increases and then ultimately the trials are done on the large number of persons.

Hence the scientists ensure that their results are reliable by repeating trials.

Learn more about reliability at brainly.com/question/1265793

#SPJ4

4 0
1 year ago
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
A book has a mass of 400g the surface of the book in contact
Brut [27]

Answer:

The pressure exerted on the table due to the book is 200 N/m².

Explanation:

The pressure exerted on the table due to the book is 200 N/m².

The given parameters;

mass of the book, m = 400 g = 0.4 kg

dimension of the table,  = 0.10m x 0.20 m.

gravitational field strength g =  10 N/kg.

The area of the table is calculated as follows;

A = 0.1 x 0.2 = 0.02 m²

The pressure exerted on the table due to the book is calculated as follows; where;

F is the force of the book due to its weight

Thus, the pressure exerted on the table due to the book is 200 N/m².

8 0
2 years ago
jak zilustrować proces Pana Jezusa przed Piłatem lub jedną wybrana przez siebie stację Drogi Krzyżowej? pomóżcie:(( To jest z re
Lena [83]
Can you please speak English so I can understand you
6 0
2 years ago
Read 2 more answers
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