How do you write an equation of a parabola witha focus and directrix?

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Beth divided 9 ounces of her granola recipe into 4 equal-sized amounts. she placed the amounts into individual bowls. the fraction 9/4 represents the number of ounces of granola in each bowl. which other number represents the amount of granola beth has in each bowl? (a) 1 1/4 (b) 2 1/4 (c) 1 3/4 (d) 3 3/4 i need !