Solve the system by using the inverse of the coefficient matrix. 5x + 4y = 86x - 3y = 33
A. {(3, -4)}
B. {(-4, 3)}
C. {(-3, 4)}
D. {(4, -3)}
Answer: D
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Find ?f.f(x, y, z) = (x3y2 - y6z3)e-z2
A. F = 3x2y2e-z2i + (2x3y - 6y5z3)e-z2j + y2ze- z2[y4z(2z2 - 3) - 2x3]k B. F = 3x2y2i + (6y5z3 - 2x3y)j + (2z2 - 3)y6z2k C. F = 3x2y2e-z2i + (2x3y - 6y5z3)e-z2j + (3 - 2z2)y6z2e-z2k D. F = 3x2i + (6y5 - 2y)j + 2z4e-z2k
Evaluate the integral.
dx
A. (cos-1 x)7 + C
B. 
+ C
C. 
+ C
D. 6(sin-1 x)5 + C
Use the circle graph to solve the problem.In a school survey, students showed these preferences for instructional materials.
About how many students would you expect to prefer computers in a school of 500 students?
A. About 180 students B. About 90 students C. About 36 students D. About 100 students
Find the vertex.f(x) = 3x2 + 18x + 31
A. (-3, 4) B. (-4, 3) C. (3, -4) D. (4, -3)