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nekit [7.7K]
3 years ago
10

3x + y = -21 x+y=-5 solving systems of equations by substitution

Mathematics
1 answer:
katen-ka-za [31]3 years ago
7 0
First : x=-5-y and then put x in the phrase above
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15. A rectangle has a length of 2x - 1 and a width of 3x + 7. Find the perimeter of this rectangle.
andrew11 [14]

Answer:

10x + 12 and 6x² + 11x - 7

Step-by-step explanation:

The perimeter (P) of a rectangle is calculated as

P = 2l + 2w ( l is length and w is width )

   = 2(2x - 1) + 2(3x + 7) ← distribute parenthesis

    = 4x - 2 + 6x + 14 ← collect like terms

     = 10x + 12

--------------------------------------------------

The area (A) of a rectangle is calculated as

A = lw

   = (2x - 1)(3x + 7) ← expand using FOIL

    = 6x² + 14x - 3x - 7 ← collect like terms

    = 6x² + 11x - 7

7 0
3 years ago
Pls help with asap thxxu! :)
Stella [2.4K]

Answer:

C- Equilateral triangle

Step-by-step explanation:

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7 0
3 years ago
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If θ = 330° and α = 300°, find the exact value of tan θ − sin α.
Vilka [71]
X = tan (330) - sin (330)
x = 0.133557089 - -0.132381629
x = 0.133557089 + 0.132381629
x = 0.265938718
7 0
3 years ago
In 2000, U.S. trade with Saudi Arabia totaled $20.6 billion. Of this total,
xxMikexx [17]

Answer:

30.1%

Step-by-step explanation:

Find the percent that was US exports by dividing 6.2 by 20.6, then multiplying it by 100

(6.2/20.6) x 100

= approximately 30.1

So, approximately 30.1% of the trade was US exports

8 0
3 years ago
5-star rating and brainiest
Lelu [443]

Answer:

Step-by-step explanation:

What to do??

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3 years ago
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