Solve the system of equations using substitution.
A. x = 
, y = 9
B. x = 9, y = 
C. x = 3
, y = 
D. x = 
, y = 3
Answer: C
Mathematics
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Find an equation for the sphere with the given center and radius.Center (0, 0, 8), radius = 5
A. x2 + y2 + 5 z2 - 16z = -39 B. x2 + y2 + 5 z2 + 16z = -39 C. x2 + y2 + z2 + 16z = -39 D. x2 + y2 + z2 - 16z = -39
Mathematics
Solve.The diagonal of a rectangular storage room is 4 yards long. If its length is 2 times its width, find the dimensions of the room.
A. 
yd by 
yd
B. 
yd by 
yd
C. 
yd by 
yd
D. 4
yd by 8
yd
Mathematics
Solve the inequality.x2 - 3x ? 0
A. [0, 3] B. (-?, 0] or [3, ?) C. (-?, -3] or [0, ?) D. [-3, 0]
Mathematics
Find the indicated sum.-3 + 1 + 5 + 9 + 13 + . . . + (4n - 7)
A. n(4n + 7) B. n(4n - 7) C. n(2n + 5) D. n(2n - 5)
Mathematics