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3 years ago

Which expression is equivalent to -5(2n - 4) + n?

Mathematics

1 answer:

ser-zykov [4K]3 years ago

8 0

Answer:

A. -9n + 20

Step-by-step explanation:

First, distribute -5 to all terms within the parenthesis:

-5(2n - 4) + n

(-5 * 2n) + (-5 * -4) + n

-10n + 20 + n

Simplify. Combine like terms:

(-10n + n) + 20

(-9n) + 20

A. -9n + 20 is your answer.

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Andrews [41]

Answer:

10 experiments

Step-by-step explanation:

Given:

Amount of substance A = $\frac{1}{2}\textrm{ g}$

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Total amount of mixture = $\frac{1}{2}\textrm{ g}+\frac{3}{4}\textrm{ g}=\frac{5}{4}\textrm{ g}$

Now, amount used for each experiment = $\frac{1}{8}\textrm{ g}$

So, number of experiments conducted = $\frac{\textrm{Total amount of mixture}}{\textrm{Amount used for each experiment}}=\frac{\frac{5}{4} }{\frac{1}{8} } =\frac{5}{4}\times 8=10$

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4 years ago