Solve. Simplify the answer.Erika spent 
of an hour on her computer visiting the history channel and the discovery channel websites. She spent 
of an hour at the history channel website. How many hours did she spend at the discovery channel website?
A. 
hr
B. 
hr
C. 
hr
D. 
hr
Answer: D
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Solve the problem.Find the vector from the origin to the center of mass of a thin triangular plate (uniform density) whose vertices are A(10, 4, 2), B(7, 9, 5), and C(2, 8, 10).
A. 
i + 7j + 
k
B. 
i - 
j - 8k
C. 
i - 1j - 
k
D. 
i - 
j - 
k
Solve the following quadratic equation using the Square Root Property. Make sure you simplify the final answer completely. Find the exact answer and a decimal approximation to the nearest tenth when possible.3x2 = 4
A. x = 
or x = - 
; x ? 1.2 or x ? -1.2
B. x = 
; x ? 1.2
C. x = 
; x ? 1.2
D. x = 
or x = - 
; x ? 0.7 or x ? -0.7
Calculate.7
+ 9.308
A. 1.933 B. 16.683 C. 9.308 D. 16.703
Find the unknown length in the right triangle. If necessary, approximate the length to the nearest thousandth.
A. 689 mi B. 26.249 mi C. 344.5 mi D. 18.5 mi