For the curve r(t), find an equation for the indicated plane at the given value of t.r(t) = (9t sin t + 9 cos t)i + (9t cos t - 9 sin t)j + 9k; normal plane at t = 5.5?.
A. y = 9
B. x - y + z = -9
C. x + y + z = -9
D. y = -9
Answer: D
Mathematics
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A. 4 tons
B. 4
tons
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D. 5 tons
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Use a proportion to solve the problem. Round to the nearest tenth as needed.A building casts a shadow 18 m long. At the same time, the shadow cast by a 44-cm tall pole is 95 cm long. Find the height of the building.
A. 37.4 m B. 6.8 m C. 8.3 m D. 38.9 m
Mathematics
Indicate whether the value of x shown is a solution to the given equation by answering true or false.Value of x: 
Equation: 7x - 10 = 6x - 9
A. True B. False
Mathematics
A clown wishes to balance a wood copy of following triangle on a stick.Trace the triangle and using only a compass and straightedge; mark the clown’s secret balancing point on the triangle.
Mathematics