Find the value of x and unknown interior angle for each triangle

Acircle has a circumference of 28.36 units what is the diameter of the circle

Solve the equation by completing the square. x^2+2x=17

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