Solve the following system by any appropriate method. If there is no real number solution, so state.xy = 90x + y = -19
A. (9, -10), (10, -9)
B. (-9, -10), (-10, -9)
C. (9, 10), (10, 9)
D. (-9, 10), (-10, 9)
Answer: B
Mathematics
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Find the center of mass of a thin plate covering the given region with the given density function.The region enclosed by the parabolas y = 72 - x2 and y = x2, with density ?(x) = x2
A. 
= 36, 
= 0
B. 
= 0, 
= 
C. 
= 0, 
= 36
D. 
= 0, 
= 72
Mathematics
Convert the mixed number to an improper fraction.5
A. 
B. 
C. 
D. 
Mathematics
Find the product.(5a + 7c)(5a - 7c)
A. 25a2 + 70ac - 49c2 B. 25a2 - 49c2 C. 25a2 - 70ac - 49c2 D. 5a2 - 7c2
Mathematics
Find the perimeter.A lot has sides measuring 5
, 5
, 3
, and 4
yards.
A. (104 + 20
) yards
B. (72
) yards
C. (52 + 20
) yards
D. (52
+ 20
) yards
Mathematics