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maria [59]
3 years ago
6

How does the appearance of spiral galaxies vary select the two correct answers

SAT
1 answer:
Maurinko [17]3 years ago
4 0

Answer:

some have a band of stars and materials through the middle, but some others do not.

they vary in how tightly their arms are wound,

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A board game that normally costs $30 is on sale for 25 percent off. What is the sale price of the game?$22. 50$27. 50$32. 50$37.
kotykmax [81]
The sale price of the game is $22.50

25% of 30 is:
30/4 = 7.5
25% off, meaning a discount
30 - 7.5 = 22.5

So your answer is $22.50


5 0
2 years ago
There are 12 of the zodiac. how many people are needed to guarantee that at least six of these people have the same sign? your a
ElenaW [278]

Answer:es, the answer is 61. This is related to a mathematical principle called the Pigeonhole Principle, which states that if you are trying to sort  n+1  objects into k sets (where nk=r;n,k,r∈Z+), at least one set must contain at least r+1 objects. (This can be proven by proof by contradiction, but is pretty standard and so generally can just be used as justification of an answer by itself.)

For your problem, you have 12 signs of the zodiac - these are your 12 sets (so k=12). You are looking to find how many it takes before a set contains 6 objects (so r+1=6 and thus r=5). Therefore, n+1=r×k+1=12×5+1=61.

Explanation:

6 0
2 years ago
what is the molarity of a solution prepared by dissolving 54.3 g of ca(no3)2 to form 355 ml of the solution?
Ratling [72]

Answer:

The molarity of a solution prepared by dissolving 54.3 g of Calcium nitrate  into 355 mL of water is 0.9881M

Molarity of solution is the ratio of the number of moles of the substance to the volume.

n is the number of moles of the compound

Mass of calcium nitrate = 54.3g

Molar mass of calcium nitrate = Ca(NO₃)₂ = 164.088 g/mol

Get the required molarity;

Hence the molarity of a solution prepared by dissolving 54.3 g of Calcium nitrate  into 355 mL of water is 0.9881M

Explanation:

:)

6 0
2 years ago
When nonmetals such as nitrogen and phosphorus are solids, they tend to be -.
BartSMP [9]

Answer:

When non metals such as nitrogen and phosphorus are solids, they tend to be very dull and brittle which is due to the tendency of elements to revert to their original form.

7 0
3 years ago
a group of 625 students has a mean age of 15.8 years with a standard deviation of 1.2 years. the ages are normally distributed.
valkas [14]

Answer: 16.2-15.8/0.6=0.6667. Use normalcdf() to find the percentage from -999 to 0.6777 which is 0.7476*625=467

Explanation:

4 0
2 years ago
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