Semi monthly means 2 times per month 
assume that pay is at beginning and middle of month (doesn't matter, but  makes it easier for me)
so 12 months
2 times per month
12 times 2=24
divide 55000 by number of months
55,000/24=2291.67
so the amount per paycheck, assuming equally distributed amounts throughout the paychecks, is $2291.67
        
             
        
        
        
It would be 6.5. The 5 after the decimal would stay the same since the number after it isn't greater than 5
        
                    
             
        
        
        
2x+38=50 
2x+38-38=50 -38
2x =12
2x/2 =12/2
x=6
        
                    
             
        
        
        
1)
n         1          2         3           4         5         6
f(n)    1033    932     831      730     629     528
First term (a₁):  <u>1033 </u>          Common difference (d): <u>-101 </u>
Explicit rule:   Recursive rule:
    Recursive rule: 




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2)
n         1          2         3           4         5         6
f(n)   -39      -29       -19        -9          9        19
First term (a₁):  <u> -39  </u>          Common difference (d): <u> +10  </u>
Explicit rule:   Recursive rule:
    Recursive rule: 




***********************************************************************************
3)
n         1          2         3           4         5         6
f(n)   3.75      2.5     1.25        0      -1.25     -2.5
First term (a₁):  <u> 3.75  </u>          Common difference (d): <u> -1.25  </u>
Explicit rule:   Recursive rule:
    Recursive rule: 




 
        
             
        
        
        
Answer is 7950,72. You can solve it's task on calculator.