Solve the linear system by using an inverse matrix.
A. {(-1, 2, 1)}
B. {(2, 1, 6)}
C. {(2, -1, 4)}
D. ?
Answer: C
Mathematics
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Find the coordinates of the centroid of the curve.Find the coordinates of the centroid of the curve x = 5 cos t + 5t sin t, y = 5 sin t - 5t cos t, 
A. (
, 
) = 
B. (
, 
) = 
C. (
, 
) = 
D. (
, 
) = 
Mathematics
Find the area of the circle. Use 3.14 or 
for ? as indicated.Use 3.14 for ?.
A. 102.0186 mi2 B. 17.898 mi2 C. 35.796 mi2 D. 25.50465 mi2
Mathematics
Solve.x2 - 36y2 = 49x + 6y = 4
A. 
B. 
C. 
D. No real solutions exist.
Mathematics
Simplify the algebraic expression by combining like terms.-6x3 - 7x3
A. -13x9 B. -13x6 C. -14x3 D. -13x3
Mathematics