Find the value of d2y/dx2 at the point defined by the given value of t.x = sin t, y = 9 sin t, t = 
A. 18
B. -9
C. 0
D. -18
Answer: C
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Which of the following is not true about similar triangles??
A.
?Similar triangles do not necessarily have the same size.
B.
?Similar triangles have the same shape.
C.
?All angles in one triangle are not necessarily the same as in the similar triangle.
D.
?All angles in both triangles are congruent.
E.
?If a, b, and c are sides of one triangle, and a', b', c' are corresponding sides of the other triangle, then 
Find the length of the radius or diameter as requested.r = 1.3 cmFind the diameter.
A. 0.65 cm B. 2.6 cm C. 5.31 cm D. 4.082 cm
Provide an appropriate answer.Find 
when u = 0 and v = 
if z(x, y) = sin x + cos y, x = u?v, and y = u + v.
A. 
= 2
B. 
= -1
C. 
= 0
D. 
= 1
Solve with calculator.The formula 
models the duration of a storm, D, in hours, in terms of the diameter of the storm, x, in miles. Use a calculator to determine the duration of a storm with a diameter of 7 miles. Round to the nearest hundredth.
A. 0.19 hours B. 1.3 hours C. 0.34 hours D. 18.52 hours