13•[18 divided by (15-9)} Evaluate

Mathematics

1 answer:

emmainna [20.7K]4 years ago

8 0

The answer is 39.

13•[18/(15-9)]
= 13•[18/6]
= 13•3
= 39

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Step-by-step explanation:

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In these kind of problems, it's always the best to just draw it. There are "formulas" to calculate this, but it's better to know intuitively.

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We can do the same for two dimensions, it just means we'll have to calculate both for x-values and y-values

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5x-3x(26x-7x-28x) systems of equation

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5x + 2(8x + -9) = 3(x + 4) + -5(2x + 7)

Reorder the terms:
5x + 2(-9 + 8x) = 3(x + 4) + -5(2x + 7)
5x + (-9 * 2 + 8x * 2) = 3(x + 4) + -5(2x + 7)
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Reorder the terms:
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Combine like terms: 5x + 16x = 21x
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Reorder the terms:
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Reorder the terms:
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-18 + 21x = 12 + 3x + (7 * -5 + 2x * -5)
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Reorder the terms:
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Solving
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Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '7x' to each side of the equation.
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Combine like terms: 21x + 7x = 28x
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Divide each side by '28'.
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Simplifying
x = -0.1785714286

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