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SVETLANKA909090 [29]
2 years ago
13

Evaluate x + 4x when x = 20.

Mathematics
1 answer:
Maru [420]2 years ago
6 0

Answer:

Step-by-step explanation:

20+4(20) 20+80 = 100

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I want to know the work of this, like the process. Please
pogonyaev
In this question, you know that the machine packs \frac{2}{3} of a box every \frac{1}{2} of a minute. Since it is constant, you simply have to double the half a minute to a full minute and then also double the rate to get \frac{4}{3} boxes packed per minute. And \frac{4}{3} is equal to 1\frac{1}{3}
3 0
3 years ago
5x+7y=31 2x+4y=16 Which of the following systems could be used to solve the given system of equations by the addition method? 10
Pani-rosa [81]
Equation 1: 5x+7y=31
Equation 2: 2x+4y=16

We can either use the 'elimination' method or the 'substitution' method to solve this simultaneous equation.

In some cases one method is easier to use than the other. For this one, it would be easier to use the elimination method

We need to eliminate either the 'x' or the 'y' to begin with. Say we want to eliminate the 'x' terms, then the next step is to make the constant the same

Equation 1: the constant of 'x' is 5
Equation 2: the constant of 'x' is 2

To make the two constants the same, think of common multiple. The lowest common multiple for 5 and 2 is 10

Equation 1:  Multiply all terms by 2 to achieve 10x
Equation 2: Multiply all terms by 5 to achieve 10x

Equation 1: 10x+14y=62
Equation 2: 10x+20y=80

Once the constant of 'x' is the same, then we can start the elimination process. Since our aim is to eliminate, one of the 'x' need to be in negative form. We can either multiply Equation 1 or Equation 2 by (-1)

Equation 1: -10x - 14y = -62
Equation 2: 10x + 20y = 80

Hence the correct answer is: Third option




3 0
3 years ago
Please help me with this question?
IgorLugansk [536]

What is the question?

4 0
3 years ago
A water tank is leaking water at a rate of 300 gallons per minute. What is this rate in gallons per second
irakobra [83]

Answer:

5 gallons per second

Step-by-step explanation:

Step 1:

300 ÷ 60 = 5

Answer:

5

Hope This Helps :)

5 0
3 years ago
Read 2 more answers
1. Refer to the equation 3x − 5y = 15. (a) Create a table of values for at least 4 points. Show your work on how you found the v
Ann [662]

Answer:

(0, 3 ), (5, 0), (10, -3), (15, -6)

Step-by-step explanation:

3x − 5y = 15

-5y = 3x + 15

y = -\frac{3}{5} x + 3

Point 1:  (0, 3 )

  y = -3/5(0) + 3

  y = 0 + 3

  y = 3

 

  Validate:

   3 = -3/5(0) + 3

   3 = 3

Point 2:  (5, 0)

  y = -3/5(5) + 3

  y = -3 + 3

  y = 0

  Validate:

   0 = -3/5(5) + 3

   0 = 0

Point 3:  (10, -3)

  y = -3/5(10) + 3

  y = -6 + 3

  y = -3

  Validate:

   -3 = -3/5(10) + 3

   -3 = -3

Point 4:  (15, -6)

  y = -3/5(15) + 3

  y = -9 + 3

  y = -6

 Validate:

   -6 = -3/5(15) + 3

   -6 = -6

6 0
3 years ago
Read 2 more answers
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