If a parabola's focus is at (1, −1) and the directrix is at y = 7, what is the equation representing this parabola? x2 − 2x + 16y − 47 = 0
x2 − 47 = 0
x2 − 2x + 16y − 49 = 0
x2 − 2x + 2y2 + 16y − 47 = 0

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

9. (y^-5)^10y^10 a. y^-60 b. y^60 c. y^-150 d. y^150 find the simplified form of each expression. 10. (4/7^5)^2 a.8/14^10 b.16/49^25 c.16/49y^10 d.8/14y^25 11. determine if the number 3.43 times 10^-6 is written in scientific notation. if not, explain. a. yes; the number is written scientific notation. b. no; the first factor is not a number between 1 and 10. c. no; it is not written as a number times a power of 10

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil