Basic Math Examples

multiply the sum of $14$ and $- 25$ with the difference of $15$ and $- 9$

Step 1

The mean of a set of numbers is the sum divided by the number of terms.

$\frac{14 - 25 + 15 - 9}{4}$

Step 2

Simplify the numerator.

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Step 2.1

Subtract $25$ from $14$ .

$\frac{- 11 + 15 - 9}{4}$

Step 2.2

Add $- 11$ and $15$ .

$\frac{4 - 9}{4}$

Step 2.3

Subtract $9$ from $4$ .

$\frac{- 5}{4}$

Step 3

Move the negative in front of the fraction.

$- \frac{5}{4}$

Step 4

Divide.

$- 1.25$

Step 5

The mean should be rounded to one more decimal place than the original data. If the original data were mixed, round to one decimal place more than the least precise.

$- 1.3$