What number must be entered into the blank so that the equation has infinitely many solutions?
10c + 15 = -- (2c + 5)

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

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

What is the sum of these mixed numbers 4 2/3+ 3 1/9