Politics. The percentage s of seats in the House of Representatives won by Democrats and the percentage v of votes cast for Democrats (when expressed as decimal fractions) are related by the equation 5 v − 2 s = 1.4 0 < s < 1 , 0.28 < v < 0.68 (A) Express v as a function of s , and find the percentage of votes required for the Democrats to win 51 % of the seats. (B) Express s as a function of v and find the percentage of seats won if Democrats receive 51 % of the votes.
Politics. The percentage s of seats in the House of Representatives won by Democrats and the percentage v of votes cast for Democrats (when expressed as decimal fractions) are related by the equation 5 v − 2 s = 1.4 0 < s < 1 , 0.28 < v < 0.68 (A) Express v as a function of s , and find the percentage of votes required for the Democrats to win 51 % of the seats. (B) Express s as a function of v and find the percentage of seats won if Democrats receive 51 % of the votes.
Solution Summary: The author calculates the percentage of votes required for the Democrats to win 51% of the seats.
Politics. The percentage
s
of seats in the House of Representatives won by Democrats and the percentage
v
of votes cast for Democrats (when expressed as decimal fractions) are related by the equation
5
v
−
2
s
=
1.4
0
<
s
<
1
,
0.28
<
v
<
0.68
(A) Express
v
as a function of
s
, and find the percentage of votes required for the Democrats to win
51
%
of the seats.
(B) Express
s
as a function of
v
and find the percentage of seats won if Democrats receive
51
%
of the votes.
Suppose an oil spill covers a circular area and the radius, r, increases according to the graph shown below where t
represents the number of minutes since the spill was first observed.
Radius (feet)
80
70
60
50
40
30
20
10
0
r
0 10 20 30 40 50 60 70 80 90
Time (minutes)
(a) How large is the circular area of the spill 30 minutes after it was first observed? Give your answer in terms of π.
square feet
(b) If the cost to clean the oil spill is proportional to the square of the diameter of the spill, express the cost, C, as a
function of the radius of the spill, r. Use a lower case k as the proportionality constant.
C(r) =
(c) Which of the following expressions could be used to represent the amount of time it took for the radius of the spill to
increase from 20 feet to 60 feet?
r(60) - r(20)
Or¹(80-30)
r(80) - r(30)
r-1(80) - r−1(30)
r-1(60) - r¹(20)
6. Graph the function f(x)=log3x. Label three points on the graph (one should be the intercept) with
corresponding ordered pairs and label the asymptote with its equation. Write the domain and range of the function
in interval notation. Make your graph big enough to see all important features.
Find the average value gave of the function g on the given interval.
gave =
g(x) = 8√√x, [8,64]
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Finite Mathematics for Business, Economics, Life Sciences, and Social Sciences (14th Edition)
A Problem Solving Approach To Mathematics For Elementary School Teachers (13th Edition)
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