Solve the problem.The number of mosquitoes M(x), in millions, in a certain area depends on the June rainfall x, in inches: 
What rainfall produces the maximum number of mosquitoes?
A. 9.5 in.
B. 361 in.
C. 0 in.
D. 19 in.
Answer: A
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Use a definite integral to find an expression that represents the area of the region between the given curve and the x-axis on the interval [0, b].y = 12?x2
A. 24?b B. 4?b3 C. -24?b D. -4?b3
Solve. Graph the solution on a number line, and express it in interval notation.x + 
? 
A. x < 
, 
B. x ? 
, 
C. x ? 
, 
D. x > 
, 
Graph the inequality.y ? 
A. 
B. 
C. 
D. 
Solve the problem using the rule of 78s.Dallas Wright took out a 48-month fixed installment loan of $6500 to purchase a new all-terrain vehicle (ATV). He began making monthly payments of $175.50. Instead of making his 27th payment, Dallas decides to repay his loan in full. How much interest will Dallas save?
A. $358.19 B. $377.93 C. $29.30 D. $1654.71