Answer:
A.
Step-by-step explanation:
Answer: from up to down 9, from side to side 12
9mph because 20 minutes time 3 is one hour so multiply 3 by 3 to get 9
Yes, they are proportional. if you divide the second fraction down to simplest form, you get 7/12, which is equal to the first fraction.
Euler's formula for a polyhedron is given by:

Make E, the subject of the formula:

Put F = 20, V = 12, to obtain E,

Therefore, there are 30 edges