Can you help me please it has to be harry potter and the philosopher's stone movie

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

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

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)