缓解压力的音乐SAT数学练习6.1

2020年11月25日发(作者：弘景)
1. Ben Frank is an electrician who installs lighting fixtures. He charges (in dollars) his
clients15h+40f where h is the number of hours worked and f is the number of fixtures
installed.
How much does Ben Frank charge when he works 7 hours and installs 9 fixtures?


2. The expression for the surface area of a cube of side length s is 6s
2
.
What is the surface area of a cube with side length

units?


3. Eric owns and operates the Hot Ham food truck. The expression 3.25b+2h gives the
cost bburgers and h hot dogs.
What is the cost of 4 burgers and 6 hot dogs?


4. The expression 12g gives the number of kilometers a car can travel using g liters of
gasoline.
How far can this car travel on 5

liters of gasoline?


5. The price of a visit to the dentist is calculated according to the
formula 50+100n where n is the number of cavities the dentist finds.
On your last visit to the dentist, 2 cavities were found.
What was the cost of your visit?


6. sh






A company manufactures bookcases. The function above gives the cost, C(q), in dollars,
of producing bookcases. What is the fixed cost of production before any bookcases
are produced?

7. The following equation shows the height, h, in meters above the ground of a
football t seconds after a particular kick.





What was the height of the football at the moment of the kick?


8.






A binary code word of length n is a string of 0's and 1's with n digits. For example, 1001 is
a binary code word of length 4. The number of binary code words, B(n), of length n, is
shown above. If the length is increased from n to n+1, how many more binary code
words will there be?
A. 2
B.


C.


D.




9.









The future value, F(t), of an investment after t years is given by the function defined
above. What is the initial value of the investment?


10.









A shoe manufacturer determines that its monthly revenue, R(q), in dollars, is given by
the function defined above, where q is the number of pairs of shoes sold each month.
What is the maximum value of the company's monthly revenue?

11.







The equation above gives the present value, P, of an investment that pays the
investor $$150per year for 1010 years. The present value is the dollar amount that is equal to
the series of future payments. If the payments are changed from $$150 to $$75, what is the
effect on the present value P?
A.
the present value stays the same
B.
the present value is halved
C.
the present value doubles
D.
the present value increases by 3%

12.