My aunt and I were approaching the same intersection, she from the south and I from the west. She was travelling at a steady speed of 20 mph, while I was approaching the intersection at 80 mph. At a certain instant in time, I was 
of a mile from the intersection, while she was 
varid="variable_id_field" variablename="impvar_4d12b457120249edbba1e7056" /> of a mile from it. How fast were we approaching each other at that instant? Round your answer to the nearest whole number.
?
A. 88 miles per hour
B. 82 miles per hour
C. 80 miles per hour
D. 78 miles per hour
E. 85 miles per hour
Answer: C
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Determine the vertex, focus, and directrix of the parabola and sketch its graph.(x + 3)2 = -16(y - 1)
A. vertex: (3, -1)
focus: (3, -5)
directrix: y = 3
B. vertex: (1, -3)
focus: (1, -7)
directrix: y = 1
C. vertex: (-3, 1)
focus: (-3, 5)
directrix: y = -3
D. vertex: (-3, 1)
focus: (-3, -3)
directrix: y = 5
Approximate to three decimal places.
A. 26.459 B. 26.458 C. 26.448 D. 26.457
Use properties of rational exponents to simplify the expression. Assume that any variables represent positive numbers.
A. x167/105
B. 
C. x83/105
D. 
Multiply.-0.4 ? (-12.6)
A. 13 B. 5.04 C. -12.2 D. -13