Solve the problem.How many four-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, if repetitions of digits are allowed?
A. 9000
B. 256
C. 8999
D. 10,000
Answer: D
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Find the volume of the described solid.The base of a solid is the region between the curve y = 5cos x and the x-axis from x = 0 to x = ?/2. The cross sections perpendicular to the x-axis are squares with diagonals running from the x-axis to the curve.
A. 6?
B. 
?
C. 
?
D. 
?
Find numbers a and b, or k, so that f is continuous at every point.
A. k = - 
B. k = 
C. k = 7
D. k = 
Solve the problem.Ron throws a ball straight up with an initial velocity of 60 feet per second from a height of 3 feet. Find parametric equations that describe the motion of the ball as a function of time. How long is the ball in the air? When is the ball at its maximum height? What is the maximum height of the ball?
A. x = 0; y = -16t2 + 60t + 3; 7.599 sec; 1.875 sec; 56.25 feet B. x = 0; y = -16t2 + 60t + 3; 3.699 sec; 1.875 sec; 3.018 feet C. x = 0; y = -16t2 + 60t + 3; 3.799 sec; 1.875 sec; 59.25 feet D. x = 0; y = -16t2 + 60t + 3; 7.399 sec; 1.875 sec; 440.862 feet
Solve the equation by completing the square.x2 + 62 = -18x
A. {9 + 
}
B. {-18 + 
}
C. {9 - 
, 9 + 
}
D. {-9 - 
, -9 + 
}