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mezya [45]
2 years ago
13

b)suppose only 1 in every 1,000 stars in the observable universe has a planetary system. how many planetary system are there? Fi

rst Answer gets brainliest and 20 pts if want more ill put up another question of hundred pts so answer this one first
Mathematics
1 answer:
rosijanka [135]2 years ago
5 0

Answer:

Please read below :)

Step-by-step explanation:

so you have 1 in a 1000, or 1/1000. But you're missing a part of the answer. If you post the whole answer I can give you the correct answer :)

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It takes 7 hours for 12 men to paint a room.
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28(brainlestplzzzzzzzzzzzzzzz)

Step-by-step explanation:

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Step by step on how to solve this equation 2 x + 3 = x − 4 because I fogot how to do basic math
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Answer:

-7

Step-by-step explanation:

2x +3 =x-4

2x - x =-4 - 7

x=-7

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Hi I have been working on this for hours and I still can't figure out what 23x3 is I would really be thankful if you can help me
maksim [4K]

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Step-by-step explanation:

6 0
2 years ago
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4. A store had 86 DVDs and 52 CDs. When the equal number of DVDs and CDs were sold,
11Alexandr11 [23.1K]

Answer:

51 DVDs

Step-by-step explanation:

Let the number of DVDs and CDs sold be x each.

<u>Initial</u>

Number of DVDs= 86

Number of CDs= 52

<u>After selling</u>

Number of DVDs= 86 -x

Number of CDs= 52 -x

Given that there are 3 times as many DVDs than CDs left,

86 -x= 3(52 -x)

<em>Expand:</em>

86 -x= 156 -3x

<em>Bring x terms to 1 side, constant to the other:</em>

3x -x= 156 -86

<em>Simplify:</em>

2x= 70

<em>Divide both sides by 2:</em>

x= 35

Amount of DVDs left

= 86 -x

= 86 -35

= 51

3 0
3 years ago
I think of a number double it add 15 my number is 21 what number was i thinking about
AleksandrR [38]

Hello from MrBillDoesMath!

Answer:

3

Discussion:

Let the number be "n",

2n + 15  = 21          =>  subtract 15 from both sides

2n = 21 - 15 = 6     =>   divide both sides by 2

n = 6/2 = 3

Check: Start with 3. Double it (gives 6), add 15 to it ( 6 + 15)  which gives 21/

Thank you,

MrB

5 0
3 years ago
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