Solve the problem.S(x) = -x3 + 6x2 + 288x + 4000, 4 ? x ? 20 is an approximation to the number of salmon swimming upstream to spawn, where x represents the water temperature in degrees Celsius. Find the temperature that produces the maximum number of salmon.
A. 8°C
B. 4°C
C. 20°C
D. 12°C
Answer: D
Mathematics
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In 
, AB = 12, AD = 18, and m
= 56°. To the nearest square unit, find the area of 
.
What will be an ideal response?
Mathematics
Solve.Police use the formula s = 
to estimate the speed s of a car in miles per hour, where d is the distance in feet that the car skidded and f is the coefficient of friction. If the coefficient of friction on a certain dry road is 0.88 and a car was traveling on it at a rate of 
how far will the car skid? (Round to the nearest foot.)
A. 422 ft B. 53 ft C. 61 ft D. 32 ft
Mathematics
Use the quadratic formula to solve the equation. Simplify any radicals.2x2 - 2x + 7 = 9x + 5
A. 
B. 
C. 
D. 
Mathematics
Verify the identity.
- 
= 4 cot x csc x
What will be an ideal response?
Mathematics