8. Simplify: 1-13----2711 +/-25-(-40) 9. Find 36-1-64) and (-64) -36. Are they equal?10. If a = -8, b = -7.C = 6, verify that ta+b)+c= a +(b + c).11.= -9 and b=-6. show that (a - b)+(b-a).If a14. The difference of an integer a and (-6) is 4. Find the value of a15. Write a pair of integers whose sum gives(i) zero:(un) a negative integer;Hui) an integer smaller than both the integers;iv) an integer greater than both the integers:(v) an integer smaller than only one of the integers.Hint. 10 6 and (-6) (ti) 4 and (-9)(0(-3) and (-5)16. For each of the following statements. write (T) for true and (F) for false:(i) The smallest integer is zero(li) -10 is greater than-7. Foice(iii) Zero is larger than every negative integer 1(iv) The sum of two necaure intents is a tiger F(v) The sum of a negatis integer and a positive integer is always a positive integer.(U) 5 and 1-3)fit 4 and 5​