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iVinArrow [24]
3 years ago
10

Three times a number added to 4, is 7. Find the number.

Mathematics
2 answers:
denis-greek [22]3 years ago
7 0

Answer:

1

Step-by-step explanation:   1x3=3+4=7

natta225 [31]3 years ago
5 0

Answer:

4 + 3 n               5

---------   =     ---------  solved in n=27

7+n                 2

step-by-step explanation:

First, let the number we are looking for be represented by  n .

"three times a number" can then be written as  3 n .

3 n  "added to 4" can this be written as  4 + 3 n

"the number plus 7" can be written as  n + 7

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Sav [38]
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3 0
3 years ago
John bought a video game that was 20% off. The game was originally $30. How much money DID HE SAVE by getting it on sale?
geniusboy [140]

Answer:

$6

Step-by-step explanation:

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7 0
3 years ago
1. Identify your variables using let statements.
Advocard [28]

The number of chicken dish is 131 dishes while the number of lobster dishes is 119 dishes

<h3>How to find the number of each type of dish.</h3>

Let

  • x = number of chicken dish and
  • y = number of lobster dish
<h3>How to determine the equations for the linear system</h3>

Since it cost $40 per dish for chicken dish, the total cost of chicken dish is 40x.

Also, since it cost $70 per dish for lobster dish, the total cost of lobster dish is 70y

So, the total cost of dish is T = 40x + 70y

Also, we know that the total cost of dish is $13,570.

So, 40x + 70y = 13570  (1)

Also, there are going to be 250 guest at the dinner and thus 250 dishes.

So, the total number of dishes is x + y = 250

So, x + y = 250 (2)

So, the equations of the linear system are

40x + 70y = 13570  (1)

x + y = 250 (2)

<h3>How to determine the solution for the linear system</h3>

Since

40x + 70y = 13570  (1)

x + y = 250 (2)

From (2), x = 250 - y

Substituting x into (1), we have

40x + 70y = 13570  (1)

40(250 - y) + 70y = 13570  (1)

10000 - 40y + 70y = 13570  

30y = 13570 - 10000

30y = 3570

y = 3570/30

y = 119

Substituting y = 119 into x, we have

x = 250 - y

x = 250 - 119

x = 131

Therefore, the number of chicken dish is 131 dishes while the number of lobster dishes is 119 dishes

Learn more about equation of linear system here:

brainly.com/question/13729904

#SPJ1

7 0
2 years ago
I need the answer please I don't know it
Vlad1618 [11]
Basically the question is asking you for the area of the triangle.
The formula to find the area of a triangle is base x height divided by 2.
So in this case you would do 27 x 15.5 = 418.5
Now you divide by 2 (209.25)
So the answer is D. Hope this helps!!
6 0
3 years ago
The base area of a square-based prism is 25 ft squared. One of the lateral faces of the prism is 30 ft squared. What is the surf
telo118 [61]

Answer:

  • 170 ft²

Step-by-step explanation:

Surface area = 4*lateral faces + 2*bases

  • A = 4*30 + 2*25 = 170 ft²
7 0
3 years ago
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