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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
how does Neisseria cause meningitis
is the branch of biology that deals with the study of microorganisms.
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
How bacteria create energy to survive?
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
which site have a normal flora
Many sites of the body have it
Skin
Nasal cavity
Oral cavity
Gastro intestinal tract
Safaa
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Binomial nomenclature
adeolu
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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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