Write the expression in the standard form a + bi.
A. 4 + 5i
B. 4 - 5i
C. 5 - 4i
D. 5 + 4i
Answer: D
Mathematics
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Solve the problem.A part used in manufacturing is shown in the figure. If the upper and lower sections are parallel, what is the angle between the diagonal and the upper section?
39°
A. 39° B. 129° C. 51° D. 141°
Mathematics
Solve the problem.If a spring stretches 3 meters when a 6-kilogram weight is attached to it, how much will it stretch when a 48-kilogram weight is attached to it?
A. 24 m B. 27 m C. 26 m D. 23 m
Mathematics
Find the range for the data set.11, 12, 13, 14, 15
A. 13 B. 4 C. 11 D. 15
Mathematics
Use a right triangle to simplify.sin (arccos x)
A. x
B. 
C. 
D. 
Mathematics