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Usimov [2.4K]
2 years ago
11

Solve the proportion 7/5=21/x

Mathematics
1 answer:
Marysya12 [62]2 years ago
8 0

Answer:

=15

Step-by-step explanation:

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A. x+x+x+3x+3x=9<br> B. x+x+x+x+x=18<br> C. x+x+x+3x+3x=18<br> D. 9x^5=18
lisov135 [29]

9514 1404 393

Answer:

  a)  C  x +x +x +3x +3x = 18

  b)  x = 2

  c)  2 cm, 6 cm

Step-by-step explanation:

a) The sum of the lengths of the sides is equal to the length of the perimeter. The appropriate equation is ...

 x +x +x +3x +3x = 18

__

b) Simplifying, the equation becomes ...

  9x = 18

  x = 2 . . . . . divide by 9

__

c) The shorter sides are x = 2 cm.

The longer sides are 3x = 6 cm.

6 0
2 years ago
Use the grouping method to factor x3 + x2 + 3x + 3
Alex

Answer:

8x +3

Step-by-step explanation:

Just collect the like terms, like terms have the same variable. So in this case, 2x, 3x, 3x all share the variable x, so we can add it together.

So when simplified:

2x +3x + 3x+ 3 = 8x +3

Hope this helped,

Cate

4 0
2 years ago
Read 2 more answers
How do I solve this? Please explain step by step,thankyou!
umka2103 [35]

Answer:

Hey there!

Angle x would be 62 degrees because angles in a triangle add to 180 degrees.

Let me know if this helps :)

4 0
3 years ago
Read 2 more answers
PLEASE HELP, pictures with for it, and you us waste it ill report you
Marat540 [252]

Answer:

it is C the 4

Step-by-step explanation:

-6 to pos 4

6 0
2 years ago
The measurement of a rectangular room on a scale drawing are 8cm x 6cm. If the scale use is 1 : 400, calculate the actual area o
rosijanka [135]

Answer:

768 m²

Step-by-step explanation:

8 x 400 = 3200 cm = 32 m

6 x 400 = 2400 cm = 24m

32 x 24 = 768 m²

8 0
2 years ago
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