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Inga [223]
3 years ago
5

Solve the equation 3/7k=12/35

Mathematics
1 answer:
zepelin [54]3 years ago
6 0
3/7k=12/35 is the answer to this question

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1. Which ratios form a proportion? Use equivalent ratios to test each pair.
kifflom [539]
The first one is C. 12/16, 15/20
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3 0
3 years ago
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it takes 21 minutes for 5 people to paint 7 walls. how many minutes does it take 3 people to paint 10 walls
tensa zangetsu [6.8K]
21/7=3mins per wall with 5 people.
Because we assume that all of the people paint at the same rate, 3 X 5=15 mins for one person working alone.
15/3=5 mins per wall with 3 people X 10 people= 50 mins for 3 people to paint 10 walls.


The answer is 50 mins.
8 0
3 years ago
0.0002077 in Scientific notation
Aloiza [94]

Answer: 2.077x10^-4

Step-by-step explanation:

7 0
3 years ago
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A newspaper is conducting a statewide survey concerning the race for governor. The newspaper will take a simple random sample of
katen-ka-za [31]

Answer:

Larger sample size gives less std error and hence test statistic is larger.

Step-by-step explanation:

Given that a newspaper  is conducting a statewide survey concerning the race for governor. The newspaper will take a simple random sample of n registered voters and determine X = the number of voters that will vote for the Democratic candidate. Is there evidence that a clear majority of the population will vote for the Democratic candidate

Group        I   II

Success    640 64

Total   1200 120

p 0.533333333 0.533333333

q 0.466666667 0.466666667

se 0.014401646 0.045542003

p diff 0.033333333 0.033333333

Z 2.314550249 0.731925055

p      0.01           0.233

we find that though p is the same, std error is very small for larger sample size thus making z statistic much bigger.  So we get p value less than 0.05 whereas for 120 sample size, std error is large so Z statistic is small thus making p value to accept null hypothesis

3 0
3 years ago
How many kilograms of tin will be required to make 250 kg of an alloy, if the alloy must contain 81% copper, 14% tin and 5% lead
uysha [10]

Answer:

35

Step-by-step explanation:

all are obeying a constant ratio

  • copper 81
  • tin 14⇒?
  • lead 5
  • total 100 ⇒250
  • ?=250*14/100=35
5 0
2 years ago
Read 2 more answers
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