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3 years ago

What addition expression is equivalent to 3-(-7)?

Mathematics

2 answers:

Lesechka [4]3 years ago

4 0

Answer:

3 - (-7)

= 3 + 7.

Step-by-step explanation:

A double negative is equivalent to a plus.

Varvara68 [4.7K]3 years ago

4 0

Subtraction a negative number is the same thing as adding a positive number.

3 - (-7) = 3 + 7

An addition expression is equivalent to 3 - (-7) is $\Large\boxed{\mathsf{3~+~7}}$

Hope This Helped! Good Luck!

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Answer:

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Step-by-step explanation:

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3 years ago

Set A of six numbers has a standard deviation of 3 and set B of four numbers has a standard deviation of 5. Both sets of numbers

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Given:

$\sigma_A=3$

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$n_B=4$

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To find:

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Solution:

Formula for variance is

$\sigma^2=\dfrac{\sum (x_i-\overline{x})^2}{n}$ ...(i)

Using (i), we get

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Similarly,

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$(5)^2=\dfrac{\sum (x_i-\overline{x}_B)^2}{4}$

$25=\dfrac{\sum (x_i-\overline{x}_B)^2}{4}$

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Therefore, the variance of combined set is 15.4.

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3 years ago

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Harlamova29_29 [7]

Answer:

Step-by-step explanation:

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3 years ago

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