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Tutors Answer Your Questions about Linear Equations And Systems Word Problems (FREE)
Question 181588: I was wondering if anyone could help me with a mixture
A chemist needs to prepare 12oz of a 9% hydrochloric acid solution. Find the amount of a 4% solution and the amount of a 12% solution she should mix to get this solution.
Thanks for the help
Click here to see answer by solver91311(5072)   |
Question 181588: I was wondering if anyone could help me with a mixture
A chemist needs to prepare 12oz of a 9% hydrochloric acid solution. Find the amount of a 4% solution and the amount of a 12% solution she should mix to get this solution.
Thanks for the help
Click here to see answer by vleith(1977)  |
Question 181776: Mrs. brandy invests a total of $8715 in two savings accounts. one account yields 8.5% simple intrest and the other 9.5% simple interest. She would like to find the amount placed in each account if a total of $754.88 in interest is received after one year
Click here to see answer by Mathtut(3670) |
Question 181753This question is from textbook
: Your are traveling to a concert. To arrive on time you plan to travel at an average speed of 45 mph. For the first two hours of the trip you travel at 40 mph. Find the expression for the total time you traveled. Then use the following verbal models to find how many hours you traveled at 55 mph to arrive on time
dist at 40 + dist at 55 = total dist
ave speed *total time = total distThis question is from textbook
Click here to see answer by ankor@dixie-net.com(6691)  |
Question 181896: Write the following numbers in scientific notation:
Number in standard notation Number in scientific notation
1,990,000,000,000,000,000,000,000,000,000
48,500
3,756
980
72
6.5
0.432
0.0999
0.005
0.00012
0.00000000000000000000000000000091093897
Insight: The following are simplified procedures for writing a number in scientific notation and reverse:
To Write a Number in Scientific Notation
1. Move the decimal point in the original number to the right or left until you obtain a number greater than or equal to 1 and less than 10.
2. Count the number of places you have moved the decimal point to obtain the number in step 1. If the decimal point was moved to the left, the count is to be considered positive. If the decimal point was moved to the right, the count is to be considered negative.
3. Multiply the number obtained in step 1 by 10 raised to the count found in step 2. (Note that the count determined in step 2 is the exponent on the base 10.)
Examples:
- Males have up to 5,800,000 red blood cells per cubic millimeter of blood, or
5,800,000 =
- The probability of winning a lottery may be 0.0000018, or
0.0000018 =
To Convert a Number given in Scientific Notation to Decimal Notation
1. Observe the exponent on the 10
2. a) If the exponent is positive, move the decimal point in the number to the right the same number of places as the exponent. Adding zeros to the number might be necessary.
b) If the exponent is negative, move the decimal point in the number to the left the same number of places as the exponent. Adding zeros might be necessary.
Examples:
- The age of the earth is estimated to be years = 4,600,000,000 years
- The average grain size in siltstone is = 0.00135
Click here to see answer by Alan3354(6059)  |
Question 181893: The Great Galaxy in Andromeda (also known as the Andromeda Galaxy or M31) is about 2.5 million light years from Earth. When we look at this galaxy today, we see light that has been traveling through space for 2.5 million years; i.e. when we look at the Andromeda Galaxy, we are seeing it as it was about 2.5 million years ago! Think about this, we are looking back in time.
1 light year is the distance that light travels in 1 year. Speed of light is 300,000 kilometers/second, find the distance that light travels from the Andromeda Galaxy to Earth in kilometers and express it in scientific notation.
Click here to see answer by Alan3354(6059) |
Question 181973This question is from textbook
: I really hate word problems please please help!!! This one also needs to be in linear equation format Thank you sooo much!!!
A pharmacist has two decongestants, one containing 0.8% pseudoephedrine HCI the other containing 1.4% of the ame substance. A prescription calls for a decongestant containing 1.1% pseudoephedrine HCI. How much of each should be used to produce 4 ounces of a 1.1% solution????This question is from textbook
Click here to see answer by stanbon(26259) |
Question 181973This question is from textbook
: I really hate word problems please please help!!! This one also needs to be in linear equation format Thank you sooo much!!!
A pharmacist has two decongestants, one containing 0.8% pseudoephedrine HCI the other containing 1.4% of the ame substance. A prescription calls for a decongestant containing 1.1% pseudoephedrine HCI. How much of each should be used to produce 4 ounces of a 1.1% solution????This question is from textbook
Click here to see answer by Alan3354(6059) |
Question 181972This question is from textbook
: I need this turned into a linear equation and cant seem to do it!!! I really appreciate any help i can get thank you!!!
The nature center sells bird seed for .75 cents per pound and sunflower seed for $1.10 per pound. To the nearest pound how many pounds of sunflower seed should be used to create a 50-pound mixture that sells for .90 cents per pound??
Thanks a whole lot for your help!!!This question is from textbook
Click here to see answer by stanbon(26259) |
Question 181964: Please help me with this problem:
In the Olympics, the Canadian team won a total of 22 medals, consisting of gold, silver, and bronze. There were five fewer gold medals than bronze, and 3 fewer bronze than silver medals. How many gold, silver, and bronze medals did Canada win?
Click here to see answer by stanbon(26259) |
Question 182080: hey guys this is a two part problem not doing so great on I could use your help please.
115. Kepler’s third law. According to Kepler’s third law of
planetary motion, the ratio t^2/r^3
has the same value for every
planet in our solar system. R is the average radius of the
orbit of the planet measured in astronomical units (AU),
and T is the number of years it takes for one complete
orbit of the sun. Jupiter orbits the sun in 11.86 years with
an average radius of 5.2 AU, whereas Saturn orbits the
sun in 29.46 years. Find the average radius of the orbit
of Saturn. (One AU is the distance from the earth to
the sun.)
116. Orbit of Venus. If the average radius of the orbit of Venus
is 0.723 AU, then how many years does it take for Venus
to complete one orbit of the sun? Use the information in question115
Click here to see answer by ankor@dixie-net.com(6691) |
Question 182436: a rental car agency charges a flat fee of $32.00 plus $3.00 per day to rent a certain car.Another agency charges a fee of $32.50 plus $3.25 per day to rent the same car.Write a system of equations to represent the cost c for renting a car at each agency for d days.
Click here to see answer by Mathtut(3670) |
Question 182346: A man is carrying rice on a journey. He passes through three custom stations. At the first he gives 1/3 of his rice; at the second he is allowed to keep 1/3 of what is left; and at the third, he gives up 1/4 of what remains. After passing through all three custom stations, he has 6 pounds less than he started with. How much rice ded he have when he started?
Click here to see answer by ankor@dixie-net.com(6691) |
Question 182486: a passenger train leaves a train depot 2 h after a frieght train leaves the same depot. the frieght train is traveling 20 mph slower than the passenger train. find the rate of each train if the passenger train overtakes the freight train in 3 h
Click here to see answer by tvandenberg(45) |
Question 182696This question is from textbook Teaching Textbooks
: I've been working on profit equations and am starting to understand, but this one added something new and I don't know how to deal with it.
Question - Rose invested some of her $15,000 in bonds that made a 6% profit and the rest in bonds that made a 10% profit. If the profit on the 10% bonds was $1,000 more than the profit on the 6% bonds, how much did she invest in the 6% bonds?
I think that if x= amount invested on the 6% bonds then
.06x = .10(15,000 -x), but I don't know where to put the extra $1000 profit? Does it even belong in the equation?
I tried .06x = .10+1,000(15,000-x), but that is a mess. Thanks for your help!This question is from textbook Teaching Textbooks
Click here to see answer by Mathtut(3670) |
Question 182839This question is from textbook Beginning and Intermediate Algebra
: I really hope someone can help me solve this equation for I didn't even know where to begin!
-An international phone call costs $2.00 for the first 3 min, plus $0.30 per minute for each minute or fractional part of a minute after the first 3 min. If x represents the number of minutes of the length of the call after the first 3 min, then 2 + 0.30x represents the cost of the call. If Jorge has $5.60 to spend on a call, what is the maximum total time he can use the phone?
Thanks for the help!This question is from textbook Beginning and Intermediate Algebra
Click here to see answer by nerdybill(2446)  |
Question 183018: A company has a work force of 21 men that produces two types of top end cabinets.
Cabinet A is limited to 150 cabinets per day
Takes 6 person days to produce 100
Has a profit of 1800 per 100
Cabinet B is limited to 200 cabinets per day
Requires 9 person days to produce 100
Has a profit of 2400 per 100
I'm really struggling to find the algebraic formula. I've tried spreading the staff across both products and calculating the man hours available and required etc but I just seem to go in circles.
I know I need 3 Lines on my graph so 3 constraints are required as otherwise the feasible domain wont be found but I'm still going in circles.
Any help will be greatly appreciated.
Click here to see answer by josmiceli(3003) |
Question 183069This question is from textbook Intermediate Algebra
: HELP!!!! Ive been trying to solve this most irritating word problem and I cant manage to find the 3rd equation. The Problem is ....
COFFEE. A coffee manufacturer sells a 10-pound package of coffee that consists of three flavors of coffee, vanilla flavored coffee costs $2/pound,Hazelnut costs $2.50/pound, and french roast cost $3/pound. The package contains the same amount of Hazelnut coffee as French roast coffee. The cost of the 10-pound package is $26. How many pounds of each type of coffee are in the package?
I labeled the equation as:
x- pounds of Vanilla flavored coffee
y- pounds of Hazelnut flavored coffee
z-pounds of French Roast flavored coffee
x + y + Z = 10
2x + 2.50y + 3z = $26
-Now if I can only manage to get the third variable Id be in good shape, BUT I just dont get it! What am I doing wrong???This question is from textbook Intermediate Algebra
Click here to see answer by jim_thompson5910(13787) |
Question 183138: The price of unleaded regular gasoline varies with the price per barrel of oil on the world market. When oil was selling for $30 per barrel I paid $1.25 per gallon for gasoline. When oil was selling for $140 per barrel, I paid $4.00 for a gallon of gasoline.
Click here to see answer by Alan3354(6059) |
Question 183216: a farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum area that the farmer can enclose with 80ft of fence? What should the dimensions of the garden be to give this area?
Click here to see answer by edjones(3292)  |
Question 183611: you are on your way to the market with 8 chickens. when you get to the market the buyer tells you that he will only take all chickens that have the same weight. you know that all but 1 chicken weighs the same. you take the 8 chickens to the scales in the market, and notice you only have enough money to use the scales twice. using these scales only twice, how do you find the lighter chicken?
Click here to see answer by ptaylor(1578)  |
Question 183765: The Johnson Farm has 500 acres of land allotted for cultivating corn and wheat.
The cost of cultivating corn and wheat is $42 and $30 pre acre respectively.
Mr.Johnson has $18,600 available for cultivating these corp.
If he used all the land and entire budget,how many acres of each crop should he plant?
Click here to see answer by math_il(6) |
Question 183765: The Johnson Farm has 500 acres of land allotted for cultivating corn and wheat.
The cost of cultivating corn and wheat is $42 and $30 pre acre respectively.
Mr.Johnson has $18,600 available for cultivating these corp.
If he used all the land and entire budget,how many acres of each crop should he plant?
Click here to see answer by josmiceli(3003) |
Question 183875: The sign says you are leaving missoula , Butte is 120 miles away and Bozeman is 200 miles away. There is a rest stop halfway between Butte and Bozeman. How far is the rest stop from Missoula. Is it 160 not sure ? Thank you
Click here to see answer by tvandenberg(45) |
Question 183990This question is from textbook mcdougal littell algebra 1
: A monthly magazine is hiring reporters to cover school events and local events. In each magazine, the managing editor wants at least 4 reporters covering local news and at least 1 reporter covering school news. The budget allows not more than 9 different reporters' articles to be in one magazine. Graph the region that shows the possible combinations of local and school events.
I'd understand if you could not display the graph, but what I really need are the coordinates.This question is from textbook mcdougal littell algebra 1
Click here to see answer by stanbon(26259) |
Question 184164: hey all I am trying to help my sis with some math I think its logic but its going over my head can you please help.
A total of 129 players entered a sigle ellimination handball tournament.in the first round of play, the top seeded player received a bye and the remaining 128 players played in 64 matches. thus, 65 players entered the second round of play . how many matches must be played to determine the tournament champion?
Click here to see answer by jim_thompson5910(13787) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240
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