- SPEED CHECKS A traffic officer used a radar gun
and found that the speeds of several cars traveling on
Main Street were:
38 mph, 42 mph, 36 mph, 38 mph, 48 mph, 44 mph
What was the mean (average) speed of the cars
traveling on Main Street?[Section 1.9] - Graph the following integers on a number line.
[Section 2.1]
a. , , 0, 2
b. The integers greater than but less than 2- Find the sum of , 20, , and 1.[Section 2.2]
Use signed numbers to solve each problem.
- LIE DETECTOR TESTS A burglar scored
on a polygraph test, a score that indicates deception.
However, on a second test, he scored , a score
that is uncertain. Find the change in the scores.
[Section 2.3] - BANKING A student has $48 in his checking
account. He then writes a check for $105 to purchase
books. The bank honors the check, but charges the
student an additional $22 service fee for being
overdrawn. What is the student’s new checking
account balance?[Section 2.3] - CHEMISTRY The melting pointof a solid is the
temperature range at which it changes state from solid
to liquid. The melting point of helium is seven times
colder that the melting point of mercury. If the melting
point of mercury is Celsius (a temperature scale
used in science), what is the melting point of helium?
(Source: chemicalelements.com)[Section 2.4]
39°
3
18
11 13
− 4 − 3 − 2 − 1 01 24
− 3 − 2 − 1 01 232 1
- BUYING A BUSINESS When 12 investors decided to
buy a bankrupt company, they agreed to assume equal
shares of the company’s debt of $660,000. How much
debt was each investor responsible for?[Section 2.5]
Evaluate each expression.[Section 2.6]
45.46.47.48.49.50.51.52.53.54.For Exercises 55 and 56, quickly determine a reasonable estimate
of the exact answer.[Section 2.6]- CAMPING Hikers make a 1,150-foot descent into a
canyon in 12 stages. How many feet do they descend
in each stage? - RECALLS An automobile maker has to recall
19,250 cars because they have a faulty engine mount.
If it costs $195 to repair each car, how much of a loss
will the company suffer because of the recall?
4(5) 2
3 32
`
45
9
(9)`
92 (9)^2
2 a12
3
b3(5)15 20 3 40
34 6( 12 5 4)
3(6) 10
32 42
10 (5)
1 2 3
2[6(5 13 )5]
5 (3)(7)(2)
Chapter 2 Cumulative Review 205