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timofeeve [1]
2 years ago
11

What are the variables?

Mathematics
1 answer:
tresset_1 [31]2 years ago
5 0

Answer:

T and R

Step-by-step explanation:

Variables are letters that are a quantity not known yet

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Please solve! I will mark brainliest if correct!
a_sh-v [17]
Hello,

So we can first assign HD videos and classic videos to specific variables, x is HD videos and y is classic videos.

Fiona bought 5 HD videos, and 2 classic videos for 31 dollars.
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Iliana bought 3 HD videos and 5 classic videos for 30 dollars.
3x + 5y = 30

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3 years ago
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Mr lin has 10 baesball his gym make 4 teams
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Step-by-step explanation:

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A train car has 23 rows that hold 4 seats each. If 3 train cars are coupled together, how many people can the train hold?
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2 years ago
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How you solve this by using solving proportions
DerKrebs [107]

3/(x + 4) = (x + 2)/5

Multiply both sides by 5 :

5 × 3/(x + 4) = 5 × (x + 2)/5

15/(x + 4) = x + 2

Multiply both sides by x + 4 :

(x + 4) × 15/(x + 4) = (x + 4) × (x + 2)

Provided that x + 4 ≠ 0, we can cancel the factors of x + 4 on the left side:

15 = (x + 4) (x + 2)

Expand the product on the right side:

15 = x² + 6x + 8

Move everything to one side:

0 = x² + 6x - 7

We can factorize easily in this case
0 = (x + 7) (x - 1)

Then

x + 7 = 0   or   x - 1 = 0

⇒   x = -7   or   x = 1

7 0
2 years ago
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