Estimating the area:

Calculating wallpaper:

we round up here because they will need a full roll to complete the room. Since they can't buy 7.92 rolls, they must buy 8.
Calculating cost:
Answer: 4th graph
Step-by-step explanation:
Answer:
60
Step-by-step explanation:
u find 75% of 80 or 75% × 80
Answer:
C = π*2r, C = π2r, or C = π(r+r)
Since 2r equals to diameter, and the circumference formula is c = πd.
C = π*2r is the answer.
C and A would be both answers