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The red cross is holding blood drives in two locations.

In one day, Center $\"\"$ collected $\"\"$ pints of blood and Center $\"\"$ collected $\"\"$ pints of blood.

Write and evaluate an expression to estimate the total number of pints of blood donated over a $\"\"$ -day period.

Find an expression for total number of pints of blood donated in three days.

An expression to estimate the total number of pints of blood donated over a $\"\"$ -day period is $\"\"$

$\"\"$

Therefore, the expression is $\"\"$ .

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Find the total number of pints of blood donated.

$\"\"$ (Ditributive property: $\"\"$ )

$\"\"$ (Multiply)

$\"\"$ (Simplify)

Therefore, the total number of pints of blood donated over a $\"\"$ -day period is $\"\"$ . \ \

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The expression for total number of pints of blood donated over a $\"\"$ -day period is $\"\"$ .

Total number of pints of blood donated over a $\"\"$ -day period is $\"\"$ .