Solve the problem. Round to the nearest tenth if necessary.All 30 of the students in a mathematics class attended class on Monday. On Tuesday only 18 students attended. What was the percent of decrease?
A. 60%
B. 33.3%
C. 66.7%
D. 40%
Answer: D
Mathematics
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Find the angle between u and v in radians.u = -8j and v = 9i - 10k
A. 0.07 B. 1.57 C. 0.00 D. 1.65
Mathematics
The reduced row echelon form of the augmented matrix of a system of equations is given. Find the solutions of the system. 
A. (-2, 18, 6, 2, 0) B. No solution C. (-2, 18, 6, 2, w) for any real number w D. (-2, 18, 6, 2)
Mathematics
Given f (x, y) = cos (e2x+ y ), find ?2f / ?x2
What will be an ideal response?
Mathematics
Write as a percent.9
A. 0.09% B. 450% C. 900% D. 0.9%
Mathematics