The arch of the underpass in the picture is a part of an ellipse. Find the equation of the arch. 

A.
B.
C.
D.
E.


Answer: E

Mathematics

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Solve the problem.Suppose y = mx + b is a mathematical model for actual time as a function of estimated time, where y represents actual time and x represents estimated time and m and b are constants. If m = 1.9 and b = -2.5, find y when x is 120 min.

A. 115.25 min B. 124.75 min C. 225.5 min D. 230.5 min

Mathematics

Find the nth term an of the geometric sequence.2, , . . .

A. an = (2)n-1
B. an = (2)n+1
C. an = (2)n
D. an = (2)n-1

Mathematics

Find the sum. 2+4+6+8+...+100

(a) 2000 (b) 200 (c) 2050 (d) 1550

Mathematics

Find an equation of the hyperbola.Vertices at (0, 4), (0, -4); asymptotes at y = ± x

A.  -  = 1
B.  -  = 1
C.  -  = 1
D.  -  = 1

Mathematics