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Firlakuza [10]
2 years ago
9

3. Evaluate and graph the solution. 3. E the "the 5x + 9-3x s 21 + ++

Mathematics
1 answer:
choli [55]2 years ago
5 0

Answer:

x=6

Step-by-step explanation:

5x+9-3x=21

5x-3x=21-9

2x=12

x=6

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John bikes at a speed of 10 miles per hour. His friend Brian is slower, his biking speed is only 8 miles per hour. d Tomorrow bo
skad [1K]

Answer:

  • 6 miles

Step-by-step explanation:

Given

  • John's speed = 10 mph
  • Brian's speed = 8 mph
  • Time 3 hours

Solution

<u>The difference in distance covered:</u>

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3 0
3 years ago
Mary is preparing for her college entrance exams in a practice test she answered 12 problems in 30 minutes at this rate how many
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Answer:

40 problems in 100 minutes

Step-by-step explanation:

This is a ratio problem.

You first divide 30 minutes by three to get how many problems she can do in 10 minutes. What you do to one side you do to the other side. So then, you should have 4 problems in 10 minute. Then, you multiply 10 by 10 and 4 by 10 to get 40 problems in 100 minutes.

6 0
3 years ago
Please help with all of question 4.​
olga55 [171]

Answer:

Step-by-step explanation:

Combine like terms: Like terms have same variable with same power and to combine the like terms, add/subtract the co efficient of the variables.

<h3>Perimeter:</h3>

      Perimeter = sum of all sides

a) Perimeter of ΔABC = AB + BC + CA

                                    = x + 14 + x + 14 + x + 14

                                    = x + x + x + 14 + 14 + 14    {Combine like terms}

                                   = 3x + 42

b) EF = DI - GH

        = 2x + 3 - x

       = 2x - x + 3

       = x + 3

c) FG = HI - ED

         = 12 + 2x - (x + 5)

         = 12 + 2x - x - 5 {To open the brackets, (-1) is distributed to x and 5}

         = 12 - 5 + 2x - x

         = 7 + x

d) Perimeter of DEFGHI = DE +  EF + FG + GH + HI + ID

                                       =  x + 5 + x + 3 + 7 +x  + x + 12 +2x + 2x + 3

                                       = x +x + x + x + 2x + 2x + 5 + 3 + 7 + 3 + 12  

                                       = 8x + 30

6 0
2 years ago
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