That depends on their numerical values.
If the GCF of w and Y is 1, multiply them together.
If they have no prime factors in common, the LCM of w and y is their product.
Y
The least common multiple of two primes x and y, is x * y.
18x2y
That would depend on the value of Y.
That would depend on what integer Y stands for.
72xy
3
If x is the multiple of y then LCM of x and y is x. Here, 80 is the multiple of 10 therefore LCM of 10 & 80 is 80.
84x3y
Their product.