Basic Math Examples

$- 2.5 {(780)}^{2} + 2825 (780) - 115$ , $812.5$

Step 1

Simplify each term.

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Step 1.1

Raise $780$ to the power of $2$ .

$- 2.5 \cdot 608400 + 2825 (780) - 115, 812.5$

Step 1.2

Multiply $- 2.5$ by $608400$ .

$- 1521000 + 2825 (780) - 115, 812.5$

Step 1.3

Multiply $2825$ by $780$ .

$- 1521000 + 2203500 - 115, 812.5$

Step 2

Simplify by adding and subtracting.

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Step 2.1

Add $- 1521000$ and $2203500$ .

$682500 - 115, 812.5$

Step 2.2

Subtract $115$ from $682500$ .

$682385, 812.5$

Step 3

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

$\frac{682385 + 812.5}{2}$

Step 4

Add $682385$ and $812.5$ .

$\frac{683197.5}{2}$

Step 5

Divide $683197.5$ by $2$ .

$341598.75$

Step 6

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.

$341598.75$