datands
18.09.2019 •
Mathematics
Amixture of 6 gallons of chemical a, 8 gallons of chemical b, and 13 gallons of chemical c is required to kill a destructive crop insect. commercial spray x contains 1, 2, and 2 parts respectively, of these chemicals. commercial spray y contains only chemical c. commercial spray z contains chemicals a, b, and c in equal amounts. how much of each type of commercial spray is needed to get the desired mixture?
Solved
Show answers
More tips
- F Family and Home 5 Tips for Choosing Toys for Your Child...
- L Leisure and Entertainment How to Find a Phone Number by Address: The Ultimate Guide...
- P Philosophy How to Properly Create a Vision Board?...
- C Computers and Internet What is Web 2.0 and How Does it Work?...
- S Style and Beauty Is Photoepilation the Solution to Unwanted Hair Forever?...
- O Other What is a Disk Emulsifier and How Does it Work?...
- F Family and Home What does a newborn need?...
- F Family and Home Choosing the Right Car Seat for Your Child: Tips and Recommendations...
- F Food and Cooking How to Get Reconfirmation of Registration?...
- C Computers and Internet How to Get Rid of Spam in ICQ?...
Answers on questions: Mathematics
- M Mathematics 3. katryn has a bag of 150 pieces of candy. 58% of the candychocolate. about how many pieces of candy in kathryn s bagate coacolate? a. 708.90c. 800.87...
- M Mathematics Water bowls at 212 degrees Fahrenheit. If a pot of water is 145 degrees, find the change in temperature needed for the water to boil....
- M Mathematics Evaluate the expression for the given value of the variable(so). 5a+5b; a= -6, b= -5 (solve)...
- M Mathematics Factorise x^2 - 5x - 36...
- A Arts How do you mix acrylic paint? What consistency should you make your acrylic paint ?...
- B Biology 1. the is the thinnest part of the earth. 2. the is the thickest part of the earth. 3. what metals are mentioned in the text?...
- B Biology Which of the following is not a unifying theme in biology? a.metabolism b.genetics c.evolution d.ecology...
- M Mathematics : Máximo común divisor (MCD)Halla los divisores de cada númer1) 36...
Ответ:
a - number of gallons of chemical A
b - number of gallons of chemical B
c - number of gallons of chemical C
x - number of gallons of spray x
y - number of gallons of spray y
z - number of gallons of spray z
CHEMICAL SPRAY X SPRAY Y SPRAY Z
a = 6 = 1/5x + 0y + 1/3z
b = 8 = 2/5x + 0y + 1/3z
c = 13 = 2/5x + y + 1/3z
So:
1/5x + 1/3z = 6
2/5x + 1/3z = 8
2/5x + y + 1/3z = 13
Multiply the first equation by (-1) and add it to the second equation:ž
- 1/5x - 1/3z = - 6
2/5x + 1/3z = 8
1/5x = 2
x = 2 * 5 = 10
From here:
1/5x + 1/3z = 6
x = 10
1/5 * 10 + 1/3z = 6
2 + 1/3z = 6
1/3z = 4
z = 4 * 3 = 12
1/5x + y + 1/3z = 13
x = 10
z = 12
2/5 * 10 + y + 1/3 * 12 = 13
4 + y + 4 = 13
8 + y = 13
y = 13 - 8 = 5
Ответ:
2 x^2 - 4 x - 3 = 0
Divide both sides by 2:
x^2 - 2 x - 3/2 = 0
Add 3/2 to both sides:
x^2 - 2 x = 3/2
Add 1 to both sides:
x^2 - 2 x + 1 = 5/2
Write the left hand side as a square:
(x - 1)^2 = 5/2
Take the square root of both sides:
x - 1 = sqrt(5/2) or x - 1 = -sqrt(5/2)
Add 1 to both sides:
x = 1 + sqrt(5/2) or x - 1 = -sqrt(5/2)
Add 1 to both sides:
x = 1 + sqrt(5/2) or x = 1 - sqrt(5/2)