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2 years ago

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Mathematics

1 answer:

oksian1 [2.3K]2 years ago

7 0

Answer:

Step-by-step explanation:

if x is 3 then you just substitue every instance of x as 3. 2(x-4) + 3x - x^2 =

2(3 - 4) + 3(3) - 3^2 =

6-8 + 9 - 9 =

-2

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Neporo4naja [7]

Answer:

The side lengths are 30, 36 and 39.

Step-by-step explanation:

To find the missing side, write a proportion using side lengths from each similar shape. A proportion is an equation that sets equal two ratios.

$\frac{13}{39}=\frac{12}{y}$

Find y by cross multiplying numerator and denominator of each fraction.

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Find the other missing side by repeating the process.

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Find y by cross multiplying numerator and denominator of each fraction.

13y = 39(10)

13y = 390

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