74 - 22 =

(a)  

-30 + 15 =

(a)  

 $-4\times7=$  

(a)  

 $-64\div8=$ 

(a)  

(-23)(-4) =

(a)  

 $-144\div-12=$  

(a)  

-28 + (-24) =

(a)