Ch ap t e r Test M athX L fo r School^
Go to PowerAlgebra.comDo y o u k n o w H OW?
Solve each proportion.
1 8 _12
'■ k 30
, 3_y+1
5 9Solve each equation. Check your answer.- 3w + 2 = w - 4
- |(fc- 1) = 7
- 6y = 12.8
c 5n + 1 3n — 5
6 --r- = -^ - - Bicycling You are riding your bicycle to p re p are for a
race. It takes you 12 m in to go 2.5 mi. W hat was your
speed in m iles p er hour?
The figures in each pair are similar. Find the
missing length.
8.5 cm- L
4ft JL
r 1
3ft6 ft m- Shadows In th e late afternoon, a 3.5-ft child casts a
60-in. shadow. The child is next to a telep h o n e pole
th at casts a 50-ft shadow, form ing sim ilar triangles.
How tall is the telep h o n e pole?
Tell whether each percent change is an increase or
decrease. Then find the percent change.- original am ount: $5000
n ew am o u n t: $6500 - original am o u n t: 1501b
n ew am ount: 135 lb
Define a variable and write an equation to model each
situation. Then solve.- Farming You have 100 ft of fencing to build a
circular sheep pen.
a. W hat is th e d iam eter of the largest p e n you can
build? Use 3.14 for tt.
b. W hat is th e area of th e largest p e n you can build? - Maps The scale on a m ap is 1 i n .: 25 mi. You
m easure 6.5 in. betw een two towns. W hat is the
actual distance? - Birds In a bird sanctuary, 30% of th e birds are
h um m ingbirds. If there are a b o u t 350 birds in
th e san c tu a ry at any given time, how m any are
hummingbirds?
Do y o u UN DERSTAND?
- Reasoning Explain w hich is m ore accurate:
m easu rin g to th e n ea rest m illim eter or to th e nearest
eighth of an inch. - Writing A 30-pack of blank CDs costs $9.50.
A 50-pack of b lan k CDs costs $13. How can you
tell w hich is th e b e tte r buy? - Error Analysis Average atten d a n ce at a school’s
basketball gam es increased from 1000 to 1500 last
year. O ne stu d en t said th at rep resen ted a 150%
increase. Explain th e stu d en t's error. W hat was the
actual percent increase?