Find an equation of variation for the given situation.y varies jointly as x and z, and y = 91 when x = 5.2 and z = 7
A. y = 5.5xz
B. y = 0.25xz
C. y = 
D. y = 2.5xz
Answer: D
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Find the equation of the line described, and express your answer in the specified form.Parallel to the line 4x - y = 6; passes through the point (0, 0); slope-intercept form
A. y = 4x
B. y = - 
x + 6
C. y = 
x
D. y = - 
x
Find the sum of the interior angles of a hexagon.
A. 180° B. 360° C. 540° D. None of These
Write the number in standard form a + bi.
A. - 
+ 
i
B. - 
+ 
i
C. - 
+ 
i
D. - 
+ 
i
Solve the problem.In 1838, the German mathematician and astronomer Friedrich Wilhelm Bessel was the first person to calculate the distance to a star other than the Sun. He accomplished this by first determining the parallax of the star, 61 Cygni, at 0.314 arc seconds (Parallax is the change in position of the star measured against background stars as Earth orbits the Sun. See illustration.) If the distance from Earth to the Sun is about 150,000,000 km and ? = 0.314 seconds = src="https://sciemce.com/media/4/ppg__ggv0526191711__f1q29g3.jpg" alt="" style="vertical-align: 0.0px;" height="194" width="259" />
What will be an ideal response?
minutes = 
degreesdetermine the distance d from Earth to 61 Cygni using Bessel's figures.