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ddd [48]
2 years ago
10

11 The area of a square is 49 cm2. What is the perimeter, in cm, of the square?

Mathematics
1 answer:
ale4655 [162]2 years ago
8 0

Answer:

<h2><u><em>28 cm</em></u></h2>

Step-by-step explanation:

The area of a square is 49 cm2. What is the perimeter, in cm, of the square?

first we use the inverse formula to find the side (√49 = 7), then multiply the side by 4 (7 x 4 = 28)

or you can use an expression

4 * √49 = 28

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Solve the system of equations: y= x^2 + 2x - 3 and y=3x+ 3.
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Answer:

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Step-by-step explanation:

To solve this, we're gonna get rid of the y's with substitution

x² + 2x - 3 = 3x + 3

Let's make this equation equal to zero

Subtract 3 from both sides

x² + 2x - 3 = 3x + 3

            - 3         - 3

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Subtract 3x from both sides

x² + 2x - 6 = 3x

    - 3x        - 3x

x² - x - 6 = 0

Factor the equation

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This means x can be -2 or 3

Let's solve it with -2 first, plug the new x in y = 3x + 3

y = 3(-2) + 3

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Do the same for x = 3

y = 3(3) + 3

y = 9 + 3 = 12

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