Solve the problem.The formula 
can be used to estimate the maximum safe velocity v, in miles per hour, at which a car can travel along a curved road with a radius of curvature r, in feet. To the nearest whole number, find the radius of curvature if the maximum safe velocity is 40 miles per hour.
A. 4,000 ft
B. 1,600 ft
C. 256 ft
D. 640 ft
Answer: D
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Find parametric equations for the line described below.The line through the point P(3, 4, -5) parallel to the vector 
A. x = -4t - 3, y = 3t - 4, z = -5t + 5 B. x = -4t+ 3, y = -3t + 4, z = 5t - 5 C. x = 4t - 3, y = -3t - 4, z = -5t + 5 D. x = 4t + 3, y = -3t + 4, z = -5t - 5
Solve the problem, using 3.14 for ?. Round to nearest tenth unless instructed differently.The striking circle in field hockey is a semicircle with a radius of 15.5 yd. Find the area of the semicircle.
A. 754.4 yd2 B. 3017.5 yd2 C. 97.3 yd2 D. 377.2 yd2
Write the equation of the ellipse with vertex at 
, foci at 
and 
style="vertical-align: middle;" data-wiris-created="true" varid="variable_id_field" variablename="impvar_7430a3b5dcb247baaf7f6d920" />. Express the equation in standard form. What will be an ideal response?
Find the greatest common factor, GCF, of the expressions.16, 10
A. 10 B. 4 C. 2 D. 1