The double implication "if and only if" is graphically represented by an arrow pointing in both direction, so the correct writing is

Answer:
Step-by-step explanation:
4 cm × 1000 = 4000 cm = 40 meters
3 cm × 1000 = 3000 cm = 30 meters
A 4 cm by 3 cm section on the map represents 40 m by 30 m.
area = 40 m × 30 m = 1200 m²
She can arrange the photos as 4 rows of 10 photos and 1 row of 3 photos or arrange the photos as 5 rows of 8 photos and 1 row of 3 photos.
Answer:

Step-by-step explanation:

Answer:
12.87 12.1 12.07 12.07
Step-by-step explanation: