Find 
and 
.f(x, y) = 
A. 
= - 
; 
= - 
B. 
= 
; 
= - 
C. 
= 
; 
= - 
D. 
= 
; 
= 
Answer: B
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Solve the problem.During the first five months of the year, Len earned commissions of $3810, $2330, $3380, $2310, and $3420. If Len must have average monthly earnings of at least $3130 in order to qualify for retirement benefits, what must he earn in the sixth month in order to qualify for benefits?
A. at least $3530 B. at least $3050 C. at least $3063 D. at least $3130
Simplify.
3
A. 
B. 
C. 4
D. 41
Solve the problem.A hall 130 feet in length was designed as a whispering gallery. If the ceiling is 25 feet high at the center, how far from the center are the foci located?
Fill in the blank(s) with the appropriate word(s).
Solve using both the addition and multiplication properties of equality.
- 
x = 
A. x = 6
B. x = - 6
C. x = - 
D. x = 