Answer: 28
Explanation:
To find the least common multiple find the multiple of both numbers and find it's least common multiply which is the multiple they both share in common
Multiples of 4 are 4,8,12,16,20,24,28,32,36,40,44
Multiples of 7 are 7,14,21,28,35,42,49
So the first common multiple that they share is 28 so the least common denominator that share is 28.