Solve the problem.A salesperson has two job offers. Company A offers a weekly salary of $360 plus commission of 8% of sales. Company B offers a weekly salary of $720 plus commission of 4% of sales. What is the amount of sales above which Company A's offer is the better of the two?
A. $9100
B. $18,000
C. $9000
D. $4500
Answer: C
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Perform the indicated operation.
+ 
- 
A. 
B. 
C. 
D. 
Solve the problem.The thermometer reads 38.1°C. Would you have a fever?
A. Yes B. No
It makes sense that the larger the area of a region, the larger the number of species that inhabit the region. Many ecologists have modeled the species-area relation with a power function and, in particular, the number of species S of bats living in caves in central Mexico has been related to the surface area A measured in 
of the caves by the equation
S = 0.7A03
(a) The cave called mission impossible near puebla, mexico, has suface area of A=90m2.
How many species of bats would expect to find in that cave?
(b) If you discover that 5 species of bats live in cave estimate the area of the cave.
?ABC is similar to ?DEF. 
If BC = n, AB = 4n - 3, EF = 4, and DE = 15, find n and AB.
A. n = 4; AB = 45
B. n = 12; AB = 45
C. n = 
; AB = 
D. n = 3; AB = 9