Find the inverse of the invertible matrix.
A. 
B. 
C. 
D. 
Answer: C
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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 = -4 + 11 cos tFind the body's acceleration at time t = ?/3 sec.
A. 
m/sec2
B. - 
m/sec2
C. 
m/sec2
D. - 
m/sec2
Solve the problem. Round your answer, if appropriate.An inverted conical water tank with a height of 12 ft and a radius of 3 ft is drained through a hole in the vertex. If the water level drops at a rate of 1 ft/min, at what rate is water (in ft3/min) draining from the tank when the water depth is 8 ft? (Hint: Use similar triangles.)
A. 
? ft3/min
B. 4? ft3/min
C. 6? ft3/min
D. 
? ft3/min
Solve the problem.Find the gross profit margin ratio if The Rose Garden Cafeteria had net sales of $389,466, and its cost of goods sold was $173,191. Round to three decimal places.
A. 1.249 to 1 B. 2.249 to 1 C. 0.445 to 1 D. 0.555 to 1
Find a matrix A and a column matrix B that describe the following tables involving credits and tuition costs. Find the matrix product AB, and interpret the significance of the entries of this product.
?
A.
AB =
Tuition for Student 1 is $1210, tuition for Student 2 is $1180, and tuition for Student 3 is $1018.
B.
AB = 
Tuition for Student 1 is $1200, tuition for Student 2 is $1150, and tuition for Student 3 is $1013.
C.
AB = 
College A costs $937 and College B costs $1140.
D.
AB = 
College A costs $892 and College B costs $1026.