Find the exact value of the trigonometric expression without the use of a calculator.cos 25° cos 35° - sin 25° sin 35°
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Find the vertex of the parabola.f(x) = -x2 + 3x - 6
A. 
B. 
C. (-3, -24)
D. (3, -6)
Mathematics
Find the flux of the vector field F across the surface S in the indicated direction.F(x, y, z) = 6i + y9z10j - y10z9k , S is the rectangular surface x = 0, -1 ? y ? 1, and -5 ? z ? 5, direction i
A. 20 B. 60 C. 120 D. 0
Mathematics
Solve the equation.
+ 3 = 0
A. {-9}
B. {9}
C. {
}
D. ?
Mathematics
Solve.3(2z - 3) = 5(z + 3) + z
A. 6 B. 24 C. All real numbers D. No solution
Mathematics