27 the price of beef is increasing the price of a

27. The price of beef is increasing. The price of a pound of beef is initially $2.50 per pound. Write an
equation for the price of a pound of beef, in dollars, after t years if:
(a) the price increases 3 cents per year.
(b) the price increases 3% per year.
28. What are the minimum degrees of the following polynomials?

29. The balance of Jorge’s savings account (in dollars) is given by
t
t B ) 065 . 1 ( 2500 ) ( = , where t is in
years.

30.
x 10 20 30 40 50
f(x) 13 18 25 34 45
(a) What is the sign of g1858
g4593
g4666uni0032uni0030g4667 ? Explain your answer.
(b) On the interval shown, does g1858g4666g1876g4667 appear to be concave up or concave down? Explain your answer.
(c) Estimate g1858
g4593
g4666uni0032uni0030g4667 .
31. Refer to the following graph of ). (
x f ′
(a) Where is f(x) increasing?
(b) Where is f(x) decreasing?

32. The graph of f(x) is given below.
(a) Use the graph to estimate
) 1 ( f
′
.
(b) Is
) 2 ( ) 1 ( f f
′
>
′
? Explain your answer.
(c) Is
) 2 ( ) 1 ( - ′ > ′ f f
? Explain your answer.
(d)
Is
) 2 ( ) 1 ( -
′
>
′
f f
? Explain your answer.
33. A puppy is growing. His weight, w , in pounds, is a function of his age, t , in months.