Kerry and three friends went out for dinner. They split a large pizza and each person had a salad and a soda. They want to leave
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The expression for (r-s)(x) is found by subtracting s from r. That difference is 
. The expression for (r+s)(x) is found by adding them, which is 
. Now we are told to evaluate (r*s)(x) which means they want us to multiply those and state the "new" expression that results. 
. There you go!
We know that
• The new charge was $0.50 to mail a letter weighing up to 1 ounce, and $0.21 for each additional ounce.
Based on the given information, the expression is
Where <em>x</em> represents additional ounces, and <em>y</em> represents a cost.
<h2>Hence, the function is</h2>