1. find the value of 3x 4y - 10 if x = 3 and y =5
2. find the value a cubed + 5a if a = 2
3. 6ab + 4bc - 2ac if a = 1, b = 2, c = 3
4. subtract 2x squared + 3x - 2 from 5x squared - 9x + 11
5. find the difference of 2x squared + 4xy squared 5xsquared y - 2
-x squared 4xy squared 3xsquared y - 10