Would you rather lose a finger or have a headache every day for the rest of your life

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

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

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota