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4 years ago

9

How do variables help you model real-world situations?

1 answer:

creativ13 [48]4 years ago

8 0

Using variables, we can represent many real life situations where the price, quantity or value of an object may be unknown. For example, many payments come in the form of monthly payments and a starting cost. Take a gym membership for example. Let y be the amount of money you have paid to the gym, x be the number of months you have gone.
y = 30x + 65
This equation models the amount of money you've paid to the gym given that the monthly fees is $30 and the registration fees was $65

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How many cars averaged less than 30 miles per gallon? 75 20 55 70

LekaFEV [45]

Your answer is 75, hope this helps you!

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3 years ago

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The length of a rectangular tabletop is 18 inches more than the width. The perimeter is 244. What is the width of the tabletop?

Colt1911 [192]

Answer:

52 in.

Step-by-step explanation:

Let the width = x.

The length is x + 18.

perimeter = 2(L + W)

244 = 2(x + x + 18)

122 = 2x + 18

2x = 104

x = 52

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3 years ago

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Artemon [7]

Answer:

$1.40

Step-by-step explanation:

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4 years ago

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What is the y-intercept for the graph of the equation 3x-5y=15

rusak2 [61]

Answer:

<h2> (0, -5)</h2>

Step-by-step explanation:

We need to convert function to slope-intrcept form y=mx+b, where:

3x - 5y = 15 {subtract 3x from both sides by 20}

-5y = -3x + 15 {divide both sides by (-5)}

y = 3/5x - 5 ⇒ <u> b = -5 </u>

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7 0

3 years ago

Is this equation an identity? (2x+1)^2-(x+1)^2=3(x+1)^2-1

sergey [27]

Answer:

See below, please

Step-by-step explanation:

Left side

${(2x + 1)}^{2} - {(x + 1)}^{2}$

$= (4 {x}^{2} + 4x + 1) - ( {x}^{2} + 2x + 1)$

$= (4 {x}^{2} - {x}^{2} ) + (4x - 2x) + (1 -1 )$

$= 3 {x}^{2} + 2x$

Right side

$3 \times {(x + 1)}^{2} - 1$

$= 3 \times ( {x}^{2} + 2x + 1) - 1$

$= 3 {x}^{2} + 6x + 3 - 1$

$= 3 {x}^{2} + 6x + 2$

After compared with both sides, we can make a conclusion that

This equation isn't an identity.

6 0

2 years ago