Write an equivalent expression using negative exponents. Then simplify, if possible.
A. x-8
B. x8
C. 
D. 8x
Answer: B
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Solve the initial value problem.u'(x) = 
- 4, u(0) = 5
A. u = 
tan-1
- 4x - 5
B. u = 
tan-1
+ 4x - 5
C. u = tan-1
- 4x + 5
D. u = 
tan-1
- 4x + 5
Solve the problem.An experimental model for a suspension bridge is built in the shape of a parabolic arch. In one section, cable runs from the top of one tower down to the roadway, just touching it there, and up again to the top of a second tower. The towers are both 12.25 inches tall and stand 70 inches apart. Find the vertical distance from the roadway to the cable at a point on the road 14 inches from the lowest point of the cable.
A. 2.16 in. B. 7.84 in. C. 1.76 in. D. 1.96 in.
Use the given information to find the exact value of the expression.sin ? = 
, ? lies in quadrant I, and cos ? = 
, ? lies in quadrant I
Find cos (? + ?).
A. 
B. 
C. - 
D. 
Solve the problem.The speed of a stream is 4 mph. If a boat travels 56 miles downstream in the same time that it takes to travel 28 miles upstream, what is the speed of the boat in still water?
A. 8 mph B. 14 mph C. 15 mph D. 12 mph