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77julia77 [94]
2 years ago
9

I need answers for this.

Mathematics
1 answer:
Pachacha [2.7K]2 years ago
7 0

Answer:

  • 2((4a +1) +8) cm
  • 8a +18 cm
  • 8a +18 = 42

Step-by-step explanation:

For the first line, you are copying the dimensions from the figure to the blanks. The dimensions on the figure are (4a +1), and (8), both in centimeters. When you have filled in that line, it will read ...

  2((4a +1) +8) cm

__

For the second line, you must collect terms and use the distributive property to eliminate parentheses from the above expression.

  2((4a +1) +8) cm = 2(4a +9) cm = 2(4a) +2(9) cm

  = 8a +18 cm

__

The third line simply sets this expression equal to the given perimeter, 42:

  8a +18 = 42

_____

<em>Additional comment</em>

To solve this equation, you can subtract 18 from both sides:

  8a +18 -18 = 42 -18

  8a = 24 . . . . . . . . . . . simplify

Then divide both sides by 8.

  8a/8 = 24/8

  a = 3

Finally, the length of the rectangle is ...

  4a +1 = 4(3) +1 = 12 +1 = 13

The rectangle is 13 cm long and 8 cm high. Its perimeter is ...

  2(13 +8) = 2(21) = 42 . . . cm

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Josh has 212 marbles. Peck has 314 marbles. Round each number to the nearest hundred. Then, type how much marbles more does Peck
Taya2010 [7]

Round each number to the nearest hundred.

 212 = 200.

 314 = 300.

How much more marbles does Peck have?

 314 - 212 = 102.

That is your answer. Hope this helps!

5 0
3 years ago
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Planet Strobe travels one full rotation around its sun in approximately 462.25 days. How many minutes does it take for Strobe to
aleksandrvk [35]

<u>Answer-</u>

It will take 665640 minutes for Strobe to travel one full rotation around its sun.

<u>Solution-</u>

Assuming all the time units i.e days and minutes are same as that of Earth, we know that a single day consists of 24 hours and each hour has 60 minutes in it.

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Number of hours that is equivalent to 462.25 days is,

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As we know the relationship between hours and minutes, 11094 hours is,

11094\times 60=665640\ hours

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4 0
3 years ago
Plz help!!
AlexFokin [52]

Answer: 50 Books

Step-by-step explanation:

B = number of books in Ruben's collection BEFORE he bought new ones.

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12% as a decimal would be 0.12..then we add the variable which represents the number of books, 0.12B.

So then we know 0.12=6

*We need to isolate the variable* So we would divide 0.12 on both sides. 0.12/0.12 and 0.12/6 which is 50.

Hope this helps! :)

7 0
3 years ago
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Wewaii [24]

Answer:

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this is the answer

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Answer:

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Step-by-step explanation:

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