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2 years ago

3x + y² - (xy)² if x = 3 and y = -5

Mathematics

2 answers:

N76 [4]2 years ago

7 0

Answer:

-191

Step-by-step explanation:

Replace variables with corresponding value.

3(3) + (-5)^2 - ((3)(-5))^2

Solve exponent.

3(3) + 25 - 225

Multiply.

9 + 25 - 225

Combine like terms.

-191

Ludmilka [50]2 years ago

7 0

Refer to the picture for answer

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Width of the miniature model = $3\frac{3}{4}$ inches

Length of the miniature model = $5\frac{1}{2}$ inches

The actual width of the boat = 15 feet

Let us find the actual length of the boat.

Write it in a proportion form.

width of model : length of model : : width of actual : length of actual

$$\Rightarrow 3\frac{3}{4}:5\frac{1}{2}::15:x$

$$\Rightarrow\frac{15}{4}:\frac{11}{2}::15:x$

$$\Rightarrow\frac{\frac{15}{4}}{\frac{11}{2}} =\frac{15}{x}$

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$$\Rightarrow{\frac{15}{4}x =15\times\frac{11}{2}$

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Hence the actual length of the boat is 22 feet.

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Answer:

Step-by-step explanation:

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Step-by-step explanation:

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ANSWER

$\boxed {D}$

EXPLANATION

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See attachment.

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