Find numbers a and b, or k, so that f is continuous at every point.
A. a = 1, b = 20
B. a = -1, b = 20
C. a = -1, b = -20
D. Impossible
Answer: B
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The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds).s = 8 sin t - cos tFind the body's velocity at time t = ?/4 sec.
A. - 
m/sec
B. 
m/sec
C. - 
m/sec
D. 
m/sec
Solve the system by the substitution method.x2 = y2 + 39x - y = 3
A. {(-8, -5)} B. {(-8, 5)} C. {(8, 5)} D. {(8, -5)}
The formula 
relates the speed 
(in mph) of a car and the distance 
of the skid when a driver hits the brakes. How far will a car skid if it is going 46 mph on dry pavement? On dry pavement, 
.
A. about 52 ft B. about 79 ft C. about 56 ft D. about 74 ft E. about 85 ft
Solve the problem.If the sales tax on an item is 6%, the sales tax on an item costing d dollars can be found by the expression 0.06d. Determine the sales tax on a camera that costs $310. Round your answer to the nearest cent.
A. $21.70 B. $15.50 C. $18.60 D. $186.00