Solve the logarithmic equation.log9 (x - 7) + log9 (x - 7) = 1
A. 
B. -10, 10
C. -
, 
D. 10
Answer: D
Mathematics
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Identify the surface by name.
+ 
- x2 = 0
A. Hyperbolic cylinder B. Elliptic cone C. Hyperboloid of one sheet D. Ellipsoid
Mathematics
Find the unit tangent vector T and the principal unit normal vector N. r(t) = 
(1 + t)3/2i + 
(1 - t)3/2j + 
tk
A. T = 
i + 
j + 
k; N = 
i + 
j
B. T = 
i - 
j + 
k; N = 
i + 
j
C. T = 
i - 
j + 
k; N = 
i + 
j
D. T = 
i - 
j + 
k; N = 
i + 
j
Mathematics
Solve the equation.
+ 3 = x - 1
A. 
B. {8}
C. {2, 8}
D. {-4}
Mathematics
Add or subtract. Write the answer in lowest terms.
- 
A. 4b B. 0 C. 2a D. 16b
Mathematics