Write the expression in the standard form a + bi.
A. -1 + i
B. -1 + 2i
C. -1 - i
D. 1 + i
Answer: A
Mathematics
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Solve the problem.A railroad tunnel is shaped like a semiellipse. The height of the tunnel at the center is 15 ft and the vertical clearance must be 
at a point 
from the center. Find an equation for the ellipse. 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Evaluate the expression.
?
?
A. -3 B. -1 C. 7 D. 2 E. 1
Mathematics
Solve the problem.In this rectangle, find the ratios of length to width and of width to length.
A. 
; 
B. 
; 
C. 
; 
D. 
; 
Mathematics
Sketch the graph of the power function by hand, using a calculator only to evaluate y-values for your chosen x-values. On the same axes, graph y = x2 using a dotted line for comparison. In each case, x ? 0.f(x) = x1.7
A. 
B. 
C. 
D. 
Mathematics