Probably Erica is charging 150% of the first month of rental/leasing an apartment.
$850 being 150% of the rental/ lease for a month
the amount Erica's fee is based is $850×100:150=$566.(6)
 
        
             
        
        
        
To find if a series is either geometric or arithmetic:
it must satisfy this property:
Arithmetic:
a(n+1) - a(n) = const
Geometric:
a(n+1)/a(n) = const
In your case:
r1 = 7 -4 = 3
r2 = 12 - 7 = 5
r1 != r2  (not arirthmetic)
Geometric check:
r1 = 7/4
r2 = 12/7
r1 != r2  (not Geometric)
so neither. 
        
             
        
        
        
Part A: Let x and y be the number of persons attending the two-day conference and y be the number of vouchers released. The equation that would best express the given is,
                                             y = 4x
Part B: The number of people attending the conference is determined by dividing the given number of vouchers by 4. The answer is 956. 
        
             
        
        
        
Step-by-step explanation:
Tip 1) Always Start from the More Complex Side.
Tip 2) Express everything into Sine and Cosine.
Tip 3) Combine Terms into a Single Fraction.
Tip 4) Use Pythagorean Identities to transform between sin²x and cos²x.
Tip 5) Know when to Apply Double Angle Formula (DAF)
I am also from nepal...very happy to see you..