Which expression is the lcd of these fractions?
6/5x^4y, 8/19xy^2, 12/2xy
a. 190x^6y^4
b. 190x^4y^2
c. 190x^4y
d. 190xy

To determine the LCD of the fractions, factor the denominators. Multiply the factors obtained; however multiply only once the common factors.
For the numerical coefficients: 5 , 19, and 2, the least common multiple is 190. For the variables involving x: x^4 , x, and x, the least common multiple is x^4. That of the variables involving y: y, y² and y is y². Thus, the answer is letter C.