Focus/ Directrix And Inverse!!! Math 11th Grade....algebra 2 Already Passed

write an equation of a parabola w/ given directrix and focus? focus= (1,2) directrix: y=4 {Ans: 1) draw a graph.....find vertex..whats b/w 2 and 4= 3 so vertex= (1,3)....to find vertex it's the "half point b/w focus and directrix but don't divide or times by 1/2 tho". 2) find C= vertex to focus..= -1 3) (x-1)² = 4(-1) (y-3) ((x-1)² / -4 ) + 3= y}find the inverse of y= 4^x +3 {Ans: x=4^y + 3 x-3 = 4^y switch forms..this from is Ben...to it has to be Bne which is the log form... y(e)= log₄(B)(x-3)(n)}equation for parabola...? {Ans: (x-h)² = 4c (y-k) vertex(midpoint of focus, b/w focus & directrix)= (h, k) c= vertex to focus.... when draw the graph.... the parabola(U/or n) shape goes toward the focus...}write an equation of a parabola w/ given vertex and focus? Vertex= (0,0) focus= (0,-2) {Ans: 1) vertex= (0,0)=(h,k) draw a graph...or 0 to -2= -2 c= -2 (x-0)² = 4(-2) (y-0) x² = -8y y=x² / -8}regression on calculator....exponential regression? {Ans: 1) stat , edit 2) type in L₁(x-values) and L₂(y-values) 3) 2nd quit, stat calc, pick EXP REG 4) hit enter until shows.}find inverse of y=