Which of the following is the equation of a parabola with a directrix of y = 2 points -7 and a vertex at (2, -4).
A. y = -1/12(x - 2)^2 - 4
B. y = -1/12(x + 2)^2 - 4

C. y = 1/12(x + 2)^2- 4
D. y = 1/12(x - 2)^2- 4

What signals you that factoring by grouping is the best method to use when factoring a problem?

17 in long 1.3 ft wide and 8in high what is the volume

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.