Explain when you know you need to rename a mixed fraction to subtract

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3