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What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups

Given: ab ≅ bc and ao ≅ oc ok − angle bisector of ∠boc find: m∠aok