The height (in feet) attained by a rocket t sec into flight is given by the function
?
.
?
When is the rocket rising and when is it descending?
?
A. The rocket is rising on the interval 
and it is descending on the interval 
where t is some positive number more than 25.
B. The rocket is rising on the interval 
and it is descending on the interval 
where t is some positive number more than 41.
C. The rocket is rising on the interval 
and it is descending on the interval 
where t is some positive number more than 65.
D. The rocket is rising on the interval 
and it is descending on the interval 
where t is some positive number more than 28.
Answer: B
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The amount A, in grams, of a radioactive substance remaining after t years is given by the following table. Use an exponential model for these data to determine the half-life of the radioactive substance. That is, determine how long it takes for half of the substance to decay. Round your answer to two decimal places. t 3 4 5 6 A 157.36 154.21 151.13 148.11?
A. 25.46 years B. 34.50 years C. 34.31 years D. 25.00 years
Find the limit using 
= 1.
A. 4/5 B. 5/4 C. 0 D. Does not exist
Solve the problem.It costs $400 to start up a business of selling hot dogs. Each hot dog costs 
to produce. Find the cost function C(x) = mx + b whose input is the number of hot dogs and whose output is the total cost.
A. C(x) = 55x + 400 B. C(x) = 400x + 0.55 C. C(x) = 0.55x + 400 D. C(x) = 0.55x - 400
Use the given graph of the quadratic function f to write its formula as 
.
A. f(x) = 
(x + 1)2 - 3
B. f(x) = 
(x - 1)2 - 3
C. f(x) = 2(x - 1)2 - 3
D. f(x) = (x - 1)2 - 3