please show your work

16. What is 0.25 as a fraction? 17. What is 0.25 as a percent? 18. What is 60% of 15? 19. Simplify: (6) + (-10) 20. Simplify: 5-(-4) 21. Simplify: (7)(-3) 22. Simplify: (-25) + (-5) 23. 8,610 + 70 = 24. Write the prime factorization of 12. 25. Write 3 x 3 x 3 x 4 x 2 x 2 in exponential notation. 26. The length of an object is estimated to be 0.000033042 meters. Write this number in scientific notation.