Write the augmented matrix for the system. 9x + 7y + 4z = -5 6x + 5y + 2z = -7 6x + 9y + 4z = -1
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Solve the problem.A tree casts a shadow 17 m long. At the same time, the shadow cast by a 60-cm tall statue is 68 cm long. Find the height of the tree. Round results to the nearest unit.
A. 19 m B. 14 m C. 15 m D. 18 m
Mathematics
Find the center (h, k) and radius r of the circle with the given equation. x2 + 8x + 16 + y2 + 18y + 81 = 36
A. (h, k) = (9, 4); r = 36 B. (h, k) = (4, 9); r = 36 C. (h, k) = (-9, -4); r = 6 D. (h, k) = (-4, -9); r = 6
Mathematics
Determine whether the function is invertible. If it is, find the inverse.{(16, 19), (12, -3), (17, -9)}
A. {(19, 16), (-3, 12), (-9, 17)} B. {(19, 16), (17, 12), (-9, -3)} C. {(16, -3), (16, 12), (-9, 17)} D. Not invertible
Mathematics
Find the reference angle of the given angle.- 
A. 
B. 
C. 
D. 
Mathematics