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VikaD [51]
3 years ago
6

Which of the following expressions is equal to -3x^2 - 27 ?

Mathematics
1 answer:
Alborosie3 years ago
3 0

Answer: D. -3x+9i)(x+3i) i hope this helped :)

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How to do linear equations 27, 28,28,30
Mekhanik [1.2K]
#27.  
First cross multiply
2 (2a-3) = 3 (a-1)
next use the distribute property on both sides
4a - 6 = 3a - 3
combine like terms, subtract 3a from both sides and add 6 to both sides
a = 3

#28
cross multiply
3x = 4, then divide both sides by 3
x = 4/3

#30
add 1/4 to both sides
3/x = 1/2 + 1/4, find a common denominator for the right side fractions
3/x = 2/4 + 1/4 = 3/4
therefore, x = 4
6 0
3 years ago
2 trains leave the station at the same time. Train A is traveling 16 miles slower than train B. The two trains are 720 miles apa
Ber [7]

Answer: the rate of speed for train A is 66 miles per hour.

Step-by-step explanation:

Let x represent the speed of train B.

2 trains leave the station at the same time. Train A is traveling 16 miles per hour slower than train B. This means that the speed of train A would be x - 16 miles per hour.

The two trains are 720 miles apart after 4 hours. It means that both trains traveled a total distance of 720 miles in 4 hours.

Distance = speed × time

Distance travelled by train A after 4 hours is

4(x - 16) = 4x - 64

Distance travelled by train B after 4 hours is

4 × x = 4x

Since the total distance travelled by both trains is 720 miles, then

4x - 64 + 4x = 720

8x = 720 - 64 = 656

x = 656/8 = 82 miles per hour

The speed of train A would be

82 - 16 = 66 miles per hour.

6 0
3 years ago
100 POINTSbrainlest to the person who get it right
Zina [86]

Answer:

[1] x² - 4/2x - 4

  • 3² - 4/2 × 3 - 4 = 9 - 4/2
  • 5/2

[2] 4 - 3x/2x + 4

  • 4 - 3 × 2/2 × 2 + 4 = 2/8
  • 1/4

[3] x²/2x² - 2

  • 0²/2 × 0² - 2
  • 0

[4] x² + 5/5 - x

  • - 2² + 5/5 + 2 = 4 + 5/7
  • 9/7

[5] - x³/x² - 4

  • - 1³/-1² - 4 = - 1/1 - 4
  • 1/3

[6] x + 3/x³ - 1

  • - 3 + 3/- 3³ - 1 = 0/- 27 - 1
  • 0

[7] 5 - x²/3x²

  • 5 - (- 4)²/3 × - 4² = 5 - 16/3 × 16
  • - 11/48

[8] - 2x + 6/2x³ - 3

  • - 2 × - 2 + 6/2 × - 2³ - 3
  • 10/- 19

[9] 4x²/- 3x² + 1

  • 4 × 1²/- 3 × 1² + 1 = 4/- 2
  • - 2

[10] 4x - 1/6x + 1

  • 4 × 3 - 1/6 × 3 + 1
  • 11/19

[11] x² - 1/x² + 1

  • 1² - 1/1² + 1 = 0/2
  • 0
8 0
2 years ago
Read 2 more answers
Need help with this math. find the Slope of a line That contains the points (5,6) (1, 4).​
stira [4]

Answer:

The slope can 1/2 or 0.5

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Jasmine made a pitcher of lemonade. One pitcher contains 1212 glasses of lemonade. After Jasmine serves 44 glasses of lemonade,
grandymaker [24]
1212-44=1168 
She can serve 1168 more glasses.
4 0
3 years ago
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