Solve the problem.If a rock falls from a height of 90 meters on Earth, the height H (in meters) after x seconds is approximately 
What is the height of the rock when x = 1.1 seconds? Round to the nearest hundredth, if necessary.
A. 95.93 m
B. 84.07 m
C. 84.61 m
D. 84.19 m
Answer: B
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Solve the problem.Write parametric equations for the tangent line to the curve of intersection of the surfaces 
and 
at the point 
A. 
B. 
C. 
D. 
Solve the problem.Sabrina plans to paint one side of a fence that seperates her yard from her neighbor's yard. The base of the fence is in the xy-plane with shape x = 30cos3t, y = 30sin3t, 0 ? t ? 
, and the height at (x, y) is 1 + 
y, all measured in feet. How much paint will she need if a gallon covers 150 square feeet?
A. 7
gallons
B. 1
gallons
C. 225 gallons
D. 
gallons
Solve the problem.The primary reason for having a control group and a treatment group in a clinical study is
A. to eliminate confounding variables. B. to save money. C. to combat the placebo effect. D. to make it easier to collect data. E. none of these
Write expanded notation.The projected population in 2050 for a certain country is 4,297,476.
A. 6 millions + 7 hundred thousands + 4 ten thousands + 9 thousands + 7 hundreds + 2 tens + 4 ones B. 4 hundred thousands + 2 ten thousands + 9 thousands + 7 hundreds + 4 tens + 7 ones + 6 C. 4 millions + 2 hundred thousands + 9 ten thousands + 7 thousands + 4 hundreds + 7 tens + 6 ones D. 4 millions + 2 hundred thousands + 9 ten thousands + 7 thousands + 4 tens + 7 ones + 6