Write a subtraction serence you can solve by using 9+7=16

[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

If a 36 inch yardstick casts a 21 foot shadow, how tall is a building whose shadow is 168 feet? what is the scale factor

I'm a polygon i have no parallel lines i am formed 3 line segments i have one right angle two of my angles are angles what am i