ABOUT RADICAL NUMBERS HELP with solutions please?

1. Subtract the sum of -11ab and -23ab from the sum of -19ab and 7ab.
2. Add -24x^2y to the difference obtained by subtracting -17x^2y from -9x^2y
3. From the sum of 3a^2-a-3 and 2a-9, subtract a^2-3a-7
4. Subtract the sum of c^2-2c+3 and 5c^2+12c+7 from -6+2x^2-11c
5. How much larger is the sum of 3x^2-2x-8 and 4x^2+2x-1 than the sum of 5x^2-4x and 2x^2-13x+4?
6. How much smaller is 4x-2y-3 than the sum of x+y-13 and 3x-7y+4
7. What must be added to 11x^2-3 to have a sum of 2x^2-4x+5
8. Subtract the difference of 4x^2-3x+9 and 2x^2-4x+15 from their sum
9. What must be subtracted from 4x^3-2x^2-3x+1 to have a difference of 3+4x-5x^2-2x^3?
10. From 5a^2-2a-9, subtract the difference obtained by subtracting 3a^2-2a+7 from 0.