Find the exact value of the expression.tan-1 (-1)
A. 
B. 
C. - 
D. 
Answer: C
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A formula is given along with the values of all but one of the variables in the formula. Find the value of the variable not given. Round to the nearest hundredth where necessary.P = 2L + 2W; P = 16, W = 6
A. 10 B. 2 C. 8 D. 5
Find the slope-intercept form for the line satisfying the conditions.Slope - 
, passing through (4, 4)
A. y = - 
x - 
B. y = - 
x + 
C. y = - 
x + 
D. y = - 
x - 
Factor completely. If the polynomial cannot be factored, say it is prime.8y2 + 36y - 20
A. 4(2y + 1)(y - 5) B. 4(2y - 1)(y + 5) C. prime D. (8y - 4)(y + 5)
Solve the problem.A barge takes 5 hours to move (at a constant rate) downstream for 45 miles, helped by a current of 2 miles per hour. If the barge's engines are set at the same pace, find the time of its return trip against the current.
A. 9 hr B. 90 hr C. 5 hr D. 7 hr