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2 years ago

Simplify expression show step by step (-2i)(8i)

Mathematics

1 answer:

TiliK225 [7]2 years ago

5 0

Answer:

Step-by-step explanation:

<u>Remember that $i^2 = -1$ </u>

(-2i)(8i)

$-16i^2$

$-16(-1)$

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2 years ago

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Viefleur [7K]

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Step-by-step explanation:

Let the first number be x and the second be y.

So:

$Average = \frac{x + y}{2}$

And:

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Substitute $Average = (1 - 30\%) * x$ in $Average = \frac{x + y}{2}$

$\frac{x + y}{2} = (1 - 30\%) * x$

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$\frac{x + y}{2} = 0.70x$

Cross multiply

$x + y = 0.70x * 2$

$x + y = 1.40x$

Collect like terms

$1.40x - x = y$

$0.40x = y$

Make x the subject

$x = \frac{y}{0.40}$

$x = 2.50y$

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$Average = (1 - 30\%) * x$

$Average = (1 - 30\%) * 2.50y$

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$Average =1.75y$

Rewrite as:

$Average =(1 + 0.75)y$

Express as percentage

$Average =(1 + 75\%)y$

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