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pantera1 [17]
3 years ago
15

The length of a rectangle is 1 less than twice the width. The area of the rectangle is 28 square feet. The equation 2w²-w-28 , w

hat is the length of the rectangle?
A) 3
B) 7
C) 8
Mathematics
2 answers:
dybincka [34]3 years ago
4 0
The answer should be B
Arisa [49]3 years ago
4 0

Answer:

B

Step-by-step explanation:

...

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Fudgin [204]

Answer:

z= - 5 √ 38

Step-by-step explanation:

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8 0
3 years ago
Two trains started moving at the same time, train A from Boston to New York, and train B from New York to Boston. The distance b
Ede4ka [16]

Answer:

  • <u>After 1.7 hours</u>

Explanation:

<u>1. Calculate the average speed of train B</u>

  • 60mph = 3/4 (s) ⇒ s = 60 (4/3) mph = 80 mph

<u>2. Build a table</u>

When the two trains meet:

Train     Average speed     Distance       time (distance/average speed)

                 mph                            

A                 60                             x                        x/60

B                 80                        240 - x                (240 - x) / 80

<u>3. Write the equation</u>

The time, when the two trains meet, is the same for both trains:

                  \dfrac{x}{60}=\dfrac{240-x}{80}\\ \\ \\ 80x=14,400-60x\\ \\ 80x+60x=14,400\\ \\ 140x=14,400\\ \\ x=14,400/140\\ \\ x=102.85miles

<u>4. Calculate the time:</u>

  • x/60 = 102.86 / 60 = 1.7 hours

The two trains will meet after 1.7 hours

7 0
2 years ago
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mel-nik [20]
Is there any answer choices so I can choose?
8 0
3 years ago
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Licemer1 [7]

Answer:

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Step-by-step explanation:

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4 0
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Answer:2n + 8 = n-3

Step-by-step explanation:

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