CHAPTER 9 Test 567
Solve by any method.
13.Solve for r. (Leave in your answer.)
Solve each problem.
14.Terry and Callie do word processing. For a certain prospectus, Callie can prepare it 2 hr
faster than Terry can. If they work together, they can do the entire prospectus in 5 hr. How
long will it take each of them working alone to prepare the prospectus? Round your an-
swers to the nearest tenth of an hour.
15.Qihong Shen paddled a canoe 10 mi upstream and then paddled back to the starting point.
If the rate of the current was 3 mph and the entire trip took hr, what was Qihong’s rate?
16.Endre Borsos has a pool 24 ft long and 10 ft
wide. He wants to construct a concrete walk
around the pool. If he plans for the walk to be of
uniform width and cover 152 , what will the
width of the walk be?
17.At a point 30 m from the base of a tower, the distance to the
top of the tower is 2 m more than twice the height of the
tower. Find the height of the tower.
18.Concept Check Which one of the following figures most closely resembles the graph of
if , , and?
A. B. C. D.
Graph each parabola. Identify the vertex, axis, domain, and range.
Solve each problem.
22.The total number (in millions) of civilians em-
ployed in the United States during the years
2004 –2008 can be modeled by the quadratic
function defined by
where represents 2004, represents
2005, and so on. (Source:U.S. Bureau of Labor
Statistics.)
(a)Based on this model, how many civilians, to the nearest million, were employed in
the United States in 2004?
(b)In what year during this period was the maximum civilian employment? (Round
down for the year.) To the nearest million, what was the total civilian employment in
that year? Use the actual x-value, to the nearest tenth, to find this number.x= 4 x= 5ƒ(x)=-0.529x^2 +8.00x+ 115ƒ 1 x 2 = ƒ 1 x 2 =-x^2 + 4 x- 1 x=- 1 y- 222 + 21
2
x^2 - 2ƒ 1 x 2 =a 1 x-h 22 +k a 60 h 70 k 60ft^2(^312)
S= 4 pr^2
9 x^4 + 4 = 37 x^212 = 12 n+ 122 + 12 n+ 12
3 - 4 x^2 + 7 x- 3 = 0
16
x-
12
x^2= 0
Pool
x x30 mxxy0 xy0
xy0xy0