25. \( |5|-|-8|= \) 26. \( |-2|+|7|= \) 27. \( |12|-|-6|= \) 28. \( |-3|+9= \) 29. \( |10|-|6|= \) \( 14-|5|= \)

39. \( -4(6+4) \div(-2)+1= \) 40. \( 12 \div(7-4)-2= \) 41. \( 1+4^{2} \div(3+1)= \)

What is the absolute value of \( -7 \)?

Write in terms of \( i \). Simplify your answer as much as possible, \( -\sqrt{-9} \)

Perform the indicated operations. Write the result in scientific notation rounded to three significant digits. \[ \left(\frac{9.6 \times 10^{-3}}{\left(2.45 \times 10^{-4}\right)\left(1.1 \times 10^{5}\right)}\right)^{6} \]

The term at position \( n \) in a sequence is \( n+2 \) Work out the \( 5^{\text {th }} \) term in this sequence. (Hint: the \( 5^{\text {th }} \) term is when \( n=5 \) )