Find the LCM of the denominators for each group of fractions 1/11 and 1/7

1/3, 2/15, and 19/25

2/7, 5/84, and 51/56

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

What is the expression in factored form? 3x^2 + 18x + 24 a. 3(x+2)(x+4) b. 3(x-2)(x+4) c. 3(x-2)(x-4) d. 3(x+2)(x-4)

Asap! i'm not good math and i'm lost.