Basic Mathematics for College Students

105. CITY PLANNING The streets shown in blue
     on the city map below are 0.35 mile apart. Find
     the distance of each trip between the two given
     locations.
     a. The airport to the Convention Center
     b. City Hall to the Convention Center
     c. The airport to City Hall


106. RETROFITS The illustration below shows the
     current widths of the three columns of a freeway
     overpass. A computer analysis indicated that the
     width of each column should actually be 1.4 times
     what it currently is to withstand the stresses of an
     earthquake. According to the analysis, how wide
     should each of the columns be?


107. ELECTRIC BILLS When billing a household, a
     utility company charges for the number of kilowatt-
     hours used. A kilowatt-hour (kwh) is a standard
     measure of electricity. If the cost of 1 kwh is
     $0.14277, what is the electric bill for a household
     that uses 719 kwh in a month? Round the answer to
     the nearest cent.


108. UTILITY TAXES Some gas companies are
     required to tax the number of therms used each
     month by the customer. What are the taxes collected
     on a monthly usage of 31 therms if the tax rate is
     $0.00566 per therm? Round the answer to the
     nearest cent.


109. Write each highlighted number in standard form.
     a. CONSERVATION The 19.6-million acre
     Arctic National Wildlife Refuge is located in the
     northeast corner of Alaska. (Source: National
     Wildlife Federation)

4.5 ft 3.5 ft 2.5 ft

Airport

Convention Center City Hall

b. POPULATION According to projections by the

International Programs Center at the U.S. Census

Bureau, at 7:16 P.M. eastern time on Saturday,

February 25, 2006, the population of the Earth hit

6.5 billionpeople.

c. DRIVING The U.S. Department of

Transportation estimated that Americans drove a

total of 3.026 trillion milesin 2008. (Source:

Federal Highway Administration)

110. Write each highlighted number in standard form.
     a. MILEAGE Irv Gordon, of Long Island, New
     York, has driven a record 2.6 million milesin his
     1966 Volvo P-1800. (Source: autoblog.com)
     b. E-COMMERCE Online spending during the
     2008 holiday season (November 1 through
     December 23) was about $25.5 billion.
     (Source: pcmag.com)
     c. FEDERAL DEBT On March 27, 2009, the
     U.S. national debt was $11.073 trillion.
     (Source: National Debt Clock)


111. SOCCER A soccer goal is rectangular and
     measures 24 feet wide by 8 feet high. Major league
     soccer officials are proposing to increase its width by
     1.5 feet and increase its height by 0.75 foot.
     a. What is the area of the goal opening now?
     b. What would the area be if the proposal is
     adopted?
     c. How much area would be added?


112. SALT INTAKE Studies done by the Centers for
     Disease Control and Prevention found that the
     average American eats 3.436 grams of salt each day.
     The recommended amount is 1.5 grams per day.
     How many more grams of salt does the average
     American eat in one week compared with what the
     Center recommends?


113. CONCERT SEATING Two types of tickets were
     sold for a concert. Floor seating costs $12.50 a ticket,
     and balcony seats cost $15.75.
     a. Complete the following table and find the
     receipts from each type of ticket.
     b. Find the total receipts from the sale of both types
     of tickets.

356 Chapter 4 Decimals

Ticket Number

type Price sold Receipts

Floor 1,000

Balcony 100

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