-
Home
- Elementary algebra
- Quadratic equations
- Applications
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
Got questions? Get instant answers now!
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.
Got questions? Get instant answers now!
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?
Got questions? Get instant answers now!
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?
Got questions? Get instant answers now!
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?
Got questions? Get instant answers now!
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?
Got questions? Get instant answers now!
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?
Got questions? Get instant answers now!
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
.)
Got questions? Get instant answers now!
Questions & Answers
Ayele, K., 2003. Introductory Economics, 3rd ed., Addis Ababa.
can you send the book attached ?
Ariel
the study of how humans make choices under conditions of scarcity
AI-Robot
U(x,y) = (x×y)1/2
find mu of x for y
U(x,y) = (xÃy)1/2
find mu of x for y
Desalegn
this is the study of how the society manages it's scarce resources
Belonwu
macroeconomic is the branch of economics which studies actions, scale, activities and behaviour of the aggregate economy as a whole.
husaini
difference between firm and industry
what's the difference between a firm and an industry
Abdul
firm is the unit which transform inputs to output where as industry contain combination of firms with similar production 😅😅
Abdulraufu
Suppose the demand function that a firm faces shifted from
Qd 120 3P
to
Qd 90 3P
and the supply function has shifted from
QS
20 2P
to
QS
10 2P .
a) Find the effect of this change on price and quantity.
b) Which of the changes in demand and supply is higher?
explain standard reason why economic is a science
factors influencing supply
scares
means__________________ends
resources. unlimited
Jan
economics is a science that studies human behaviour as a relationship b/w ends and scares means which have alternative uses
Jan
calculate the profit maximizing for demand and supply
Why qualify 28 supplies
Milan
out-of-pocket costs for a firm, for example, payments for wages and salaries, rent, or materials
AI-Robot
concepts of supply in microeconomics
identify a demand and a supply curve
there's a difference
Aryan
Demand curve shows that how supply and others conditions affect on demand of a particular thing and what percent demand increase whith increase of supply of goods
Israr
Hi Sir please how do u calculate Cross elastic demand and income elastic demand?
Abari
Got questions? Join the online conversation and get instant answers!
Source:
OpenStax, Elementary algebra. OpenStax CNX. May 08, 2009 Download for free at http://cnx.org/content/col10614/1.3
Google Play and the Google Play logo are trademarks of Google Inc.