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ziro4ka [17]
3 years ago
11

Choose the correct simplification of the expression (−2x + 4y)(3x − 7y).

Mathematics
2 answers:
ivolga24 [154]3 years ago
6 0
(-2x+4y)(3x-7y)=-6x^2-28y^2
Nadya [2.5K]3 years ago
3 0
(-2x + 4y)(3x - 7y) = -6x^2 - 28y^2 + 12yx
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Leah drives 45 miles per hour for 2 hours then 32 miles per hour for 90 minutes . What is her average speed
Citrus2011 [14]

Answer:

 =39.42857143 miles per hour

Step-by-step explanation:

To find the average speed, we need to the total distance and the total time

Distance 1

45 miles for 2 hours

45*2 = 90 miles

Distance 2

90 minutes * 1 hour/60 minutes = 1.5 hours

32 miles * 1.5 hours =48 miles

The total distance = 90+48 = 138 miles

The total time = 2 +1.5 = 3.5 hour

The average speed = total distance/ total time

                                  = 138/3.5

                                  =39.42857143 miles per hour

3 0
3 years ago
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24=7/8g I need help with this equation and explain how to do it please?
Gnesinka [82]
<span>      add</span><span> up the two equivalent fractions </span>
<span>Add the two equivalent fractions</span><span> which now have a common denominator</span>

<span>Combine the numerators together, put the sum or difference</span><span> over the common denominator then reduce to lowest terms if possible. tell me if this helped you.</span>
6 0
3 years ago
Response will be saved automatically.
Charra [1.4K]

Answer:

443.28

Step-by-step explanation:

Subtract 42.24 from 570.3 three times.

3 0
3 years ago
The owner of a cattle ranch would like to fence in a rectangular area of 3000000 m^2 and then divide it in half with a fence dow
Reika [66]
If you notice the picture below, the amount of fencing, or perimeter, that will be used will be 3w + 2l

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solve for "w", to see what critical points you get, and then run a first-derivative test on them, for the minimum

notice the 0=w^2\implies 0=w   so.  you can pretty much skip that one, though is a valid critical point, the width can't clearly be 0

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8 0
3 years ago
PLEASE HELP WITH THESE 4 PROBLEMS
Marizza181 [45]

Answer:

  • y = -5/2x + 5
  • y = 2x -1
  • y = 24/11
  • y = 4x + 4

Step-by-step explanation:

To solve for y, subtract the x-term and divide by the coefficient of y.

5x +2y = 10

  2y = -5x +10

  y = -5/2x + 5

__

2y -4x = -2

  2y = 4x -2

  y = 2x -1

__

7y +4y = 24

  y = 24/11

We assume there is a typo, but cannot tell what it is. Use the same method as described and demonstrated for the other problems.

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-2x +1/2y = 2

  1/2y = 2x +2

  y = 4x +4

8 0
3 years ago
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