Solve the problem.A piece of land is shaped like a right triangle. Two people start at the right angle of the triangle at the same time, and walk at the same speed along different legs of the triangle. If the area formed by the positions of the two people and their starting point (the right angle) is changing at 
then how fast are the people moving when they are 
from the right angle? (Round your answer to two decimal places.)
A. 1.25 m/s
B. 2.50 m/s
C. 5.00 m/s
D. 0.80 m/s
Answer: B
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Parametrize the surface S.S is the portion of the sphere x2 + y2 + z2 = 81 between z = - 
and z = 
.
What will be an ideal response?
Use special right triangles to evaluate the expression.sec 30°
A. 
B. 
C. 
D. 2
Provide an appropriate response.The following graph represents the speed of a truck as a function of time.
a.What is the speed of the truck at 14 seconds? b. Identify and interpret the intercepts.
A. a. 40 mph. b. (8, 40); (24, 40) At 8 and 24 seconds, the speed is 40 mph. B. a. 30 mph b. (0, 0); (32, 0) At 0 and 32 seconds, the speed is 0 mph. C. a. 40 mph b. (0, 0); (32, 0) At 0 and 32 seconds, the speed is 0 mph. D. a. 40 mph b. (0, 0) At 0 seconds, the speed is 0 mph.
Use multiplication shortcuts to find the product.5 × 100
A. 600 B. 5000 C. 500 D. 50