Write the statement as a power function equation. Use k as the constant of variation.The surface area of a sphere S varies directly as the square of its radius r.
A. S = k2r
B. S = 
C. S = 
D. S = kr2
Answer: D
Mathematics
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Round to the indicated place value.Round to the nearest hundredth: 13.9263
A. 13.925 B. 13.93 C. 13.94 D. 13.926
Mathematics
Find an equation for the graph.
A. y = 5 sin (2x)
B. y = 2 sin (5x)
C. y = 5 sin 
D. y = 2 sin 
Mathematics
Find the focus and directrix of the parabola.y = -2x2
A. 
, x = 
B. 
, y = -
C. 
, x = 
D. 
, y = 
Mathematics
Evaluate f(x) at the given value of x.f(x) = 
; x = -8
A. - 
B. 
C. 1
D. 
Mathematics