the wallpaper border that runs all the way around a room is 20f^2+ 18f - 2 long. Three sides of the room have the following lengths of the border 12f^2 +6f 5f^2- 2f + 2 and 3f^2 +5f - 2. What is the length of the 4th side of the room?​

answer: the four apples you took away.

step-by-step explanation:

answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0

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