Option a, as the decimal point moves 7 places to the left :)
Step-by-step explanation:
1. Hold up all ten fingers on your hand
2. Count N fingers from the left
3. Lower that finger
4. Read off the answer from your finger. The number of fingers before that lowered finger give you the number of tens in the answer.
Answer:
86 cm.
Step-by-step explanation:
If we add 1 more triangle to one in the picture we that:
If we place 6 triangles together the perimeter will be 6 + 2 = 6
for 8 triangles the perimeter is 10 .
For 84 the perimeter will be 86 cm.
