Write a system of equations to describe the problem situation. Use guess and check to solve the problem.
An airplane flies westbound from Denver to San Francisco (950 miles) with the wind in 3.8 hours. On a return flight against the same wind, the travel time is 5 hours. Find the speed of the wind, w.
A) w = 45 mph
B) w = 40 mph
C) w = 35 mph
D) w = 30 mph
E) w = 25 mph
D) w = 30 mph
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Find the exact value of the expression.csc 480°
A. - 
B. -2
C. 
D. 
Perform the indicated operations and simplify the result. Leave the answer in factored form.
+ 
A. 
B. 
C. 
D. 
Find the equation of the line described, and express your answer in the specified form.Parallel to the line y = -3x; passes through the point (2, 3); slope-intercept form
A. y = -3x + 9 B. y = -3x - 9 C. y = -3x D. y - 3 = -3x - 2
Determine the intervals on which the function is increasing, decreasing, and constant.
A. Increasing on (?, 0); Decreasing on (0, -?) B. Increasing on (-?, 0); Decreasing on (-?, 0) C. Increasing on (0, ?); Decreasing on (-?, 0) D. Increasing on (-?, 0); Decreasing on (0, ?)