Y=2x2+18 find coordinates of the vertex

Step-by-step explanation:

x- coordinate of the vertex is

x= -b/2a = -0/2*2 = 0

y-coordinate is

y= 2*0 +18 = 18

so vertex is at (0, 18)

80° is the measure of gh

step-by-step explanation:

circle f is congruent to circle j

we have two circle with center f and j.

both circles are congruent. the radius of the circle would be equal.

see the attachment for the circle.

we are given ∠efd ≅ ∠gjh

therefore, arc (ed) = arc (gh)     (∴ circle f is congruent to circle j)

but ∠dfe=80°=arc (ed)

therefore, arc (gh) = 80°

thus, 80° is the measure of gh

i'm not really sure how to answer that

step-by-step explanation: