$\text{a)30 + ( - 59 - 15 ) }$
$\text{ = 39 - 59 - 15 }$
$\text{ = - 44 } $
$\text{b) - 22 + ( 16 - 41 ) }$
$\text{ = - 22 + 16 - 41 }$
$\text{ = - 47 }$
$\text{c) - ( 76 - 35 ) + 27}$
$\text{= - 76 + 35 + 27 }$
$\text{= - 41 + 27 }$
$\text{ = - 14 }$
$\text{d) ( 40 - 80 )- 21}$
$\text{= 40 - 80 - 21}$
$\text{= - 40 - 21 }$
$\text{ = - 61 }$
$\text{e) - (33 - 60 ) + 48}$
$\text{= - 33 - 60 + 48 }$
$\text{ = 75 }$
$\text{f) 15 - ( 35 - 70 ) }$
$\text{ = 15 - 35 + 70 }$
$\text{ = - 20 + 70 }$
$\text{ = 50 }$
$\text{g) 18 - ( - 90 - 30 ) }$
$\text{= 18 + 90 + 30 }$
$\text{ = 18 + 120 }$
$\text{ = 138 }$
$\text{h) 26 - ( 100 - 150 ) }$
$\text{= 26 - 100 + 150 }$
$\text{ = - 74 + 150 }$
$\text{ = 76 }$
