Determine if the parabola whose equation is given opens upward or downward.y = x2 - 3x - 9
A. downward
B. upward
Answer: B
Mathematics
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Find the unit tangent vector of the given curve.r(t) = (9t cos t - 9 sin t)j + (9t sin t + 9 cos t)k
A. T(t) = (-9 sin t)j + (9 cos t)k
B. T(t) = - 
(sin t)j + 
(cos t)k
C. T(t) = (9 cos t)j - (9 sin t)k
D. T(t) = (-sin t)j + (cos t)k
Mathematics
Provide an appropriate response.31.6% of what number is 712.34? (nearest whole number) Use the percentage formula.
A. 2,251 B. 4 C. 23 D. 2,254 E. none of the above
Mathematics
Find the inverse of the matrix A, if it exists.A = 
A. A-1 does not exist.
B. A-1 = 
C. A-1 = 
D. A-1 = 
Mathematics
Verify that each equation is an identity.tan ? ? csc ? = sec ?
What will be an ideal response?
Mathematics