Find the least common denominator for these two rational expressions. x/x^2-4 5x/x^2-7x+10

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120