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Anastaziya [24]
3 years ago
11

Simplify the following expression: 2(3 + a) + 6(a + 2)

Mathematics
2 answers:
mote1985 [20]3 years ago
6 0
I believe the answer is C
iris [78.8K]3 years ago
5 0

Answer:

C

Step-by-step explanation:

2(3+ a) + 6(a+2)

6+ 2a + 6a + 12

8a + 18

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The length is 15 inches and width is 9 inches

Step-by-step explanation:

Let

l be the length

and

w be the width

w = l-6

The area of rectangle is 135 ft^2

The formula for area is:

Area=l*w\\135=l*(l-6)\\135=l^2-6l\\l^2-6l-135=0\\l^2+9l-15l-135=0\\l(l+9)-15(l+9)=0\\(l+9)(l-15)=0\\l+9 = 0 => l=-9\\l-15 = 0 => l=15\\

As the length cannot be negative, so we will use the value of length 15

If length 15,

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w=15-6

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So,

The length is 15 inches and width is 9 inches

Keywords: Area of rectangle, Quadratic equation

Learn more about quadratic equation at:

  • brainly.com/question/10941043
  • brainly.com/question/10978510

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Step-by-step explanation:

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