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Practice set e
A study of the air quality in a particular city by an environmental group suggests that
years from now the level of carbon monoxide, in parts per million, in the air will be
(a) What is the level, in parts per million, now?
(b) How many years from now will the level of carbon monoxide be at 8 parts per million? Round to the nearest tenth.
(a).
parts per million (b).
years
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Sample set f
A contractor is to pour a concrete walkway around a swimming pool that is 20 feet wide and 40 feet long. The area of the walkway is to be 544 square feet. If the walkway is to be of uniform width, how wide should the contractor make it?
Step 1: Let
= the width of the walkway.
Step 2: A diagram will help us to get the equation.
(Area of pool and walkway) — (area of pool) = (area of walkway)
Check a width of 4 feet as a solution.
Area of pool = (20)(40) = 800
Area of walkway =
This solution checks.
Step 5: The contractor should make the walkway 4 feet wide.
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Practice set f
A contractor is to pour a concrete walkway around a swimming pooi that is 15 feet wide and 25 feet long. The area of the walkway is to be 276 square feet. If the walkway is to be of uniform width, how wide should the contractor make it?
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Exercises
Some of the following problems have actual applications and some are intended only as logic developers. A calculator may be helpful. The problems appear in groups and correspond to the noted Sample Set problem.
Sample set a—type problems
The manufacturer of electronic fuel injectors determines that the number
of injectors sold is related to the price
per injector by
At what price should the manufacturer price the injectors so that 112 of them are sold?
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The owner of a stained-glass shop determines that the number
of pieces of a particular type of glass sold in a month is related to the price
per piece by
At what price should the shop buyer price the glass so that 162 sell?
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It is estimated that
years from now the population of a certain city will be
(a) What is the population now?
(b) How many years from now will the population be 12,000?
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It is estimated that
years from now the population of a certain city will be
(a) What is the population now?
(b) How many years from now will the population be 24,000?
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If an object is thrown vertically upward, its height
, above the ground, in feet, after
seconds is given by
, where
is the initial height from which the object is thrown and
is the initial velocity of the object. Using this formula and an approach like that of Sample Set A, solve this problem.
A ball thrown vertically into the air has the equation of motion
(a) How high is the ball at
(the initial height of the ball)?
(b) How high is the ball at
(after 1 second in the air)?
(c) When does the ball hit the ground? (
Hint: Determine the appropriate value for
then solve for
.)
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Questions & Answers
the study of living organisms and their interactions with one another and their environments
AI-Robot
HOW CAN MAN ORGAN FUNCTION
the diagram of the digestive system
allimentary cannel
Ogenrwot
They formed in two ways first when one sperm and one egg are splited by mitosis or two sperm and two eggs join together
Oluwatobi
Genetics is the study of heredity
Misack
how does twins formed?
Misack
discuss biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles
the study of living organisms and their interactions with one another and their environment.
Wine
discuss the biological phenomenon and provide pieces of evidence to show that it was responsible for the formation of eukaryotic organelles in an essay form
list any five characteristics of the blood cells
Shaker
lack electricity and its more savely than electronic microscope because its naturally by using of light
advantage of electronic microscope is easily and clearly while disadvantage is dangerous because its electronic. advantage of light microscope is savely and naturally by sun while disadvantage is not easily,means its not sharp and not clear
Abdullahi
cell theory state that every organisms composed of one or more cell,cell is the basic unit of life
Abdullahi
is like gone fail us
DENG
cells is the basic structure and functions of all living things
Ramadan
is organisms that are similar into groups called tara
Yamosa
in what situation (s) would be the use of a scanning electron microscope be ideal and why?
A scanning electron microscope (SEM) is ideal for situations requiring high-resolution imaging of surfaces. It is commonly used in materials science, biology, and geology to examine the topography and composition of samples at a nanoscale level. SEM is particularly useful for studying fine details,
Hilary
cell is the building block of life.
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Source:
OpenStax, Elementary algebra. OpenStax CNX. May 08, 2009 Download for free at http://cnx.org/content/col10614/1.3
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