Answer:
the markdown of the Playstation is $56
Step-by-step explanation:
$280 × .02 = 56
Answer:
A.1296
Step-by-step explanation:
Given
A laboratory technician needs to make a 117-liter batch of a 20% acid solution.
How much the technician combine an acid solution that is pure acid with another that is 10% to get the desired concentration.
To proof
let us assume that the solution that is pure acid = x liters
let us assume that the anthor solution that is 10% = y liters
Than
the equation becomes
x + y = 117
As given in the question
technician needs to make a 117-liter batch of a 20% acid solution
laboratory technician combine an acid solution that is pure acid with another that is 10% to get the desired concentration
Convert 20% in the simpler form
![=\frac{20}{100}](https://tex.z-dn.net/?f=%3D%5Cfrac%7B20%7D%7B100%7D)
= 0.2
Convert 10% in the simpler form
![=\frac{10}{100}](https://tex.z-dn.net/?f=%3D%5Cfrac%7B10%7D%7B100%7D)
= 0.1
Than the equation becomes
0.2 × 117 = x + 0.1y
234 = 10x + y
Than the two equation are
x + y = 117
234 = 10x + y
subtracted x + y = 117 from 234 = 10x + y
10x+y -x -y = 234 -117
9x = 117
x= 13
put this in the equation x + y = 117
13 + y =117
y = 117 - 13
y = 104
Therefore
The solution that is pure acid be 13 liters.
than the other solution that is 10% is 104 liters.
Hence proved
Option d- x=-5
the zero is where the line crosses the x-axis
Answer:
The answer to your question is below
Step-by-step explanation:
The formula to calculate the area of a circle = πr²
The formula to calculate the area of a cylinder = πr²h
The formula to calculate the area of a cone = 1/3πr²h
So, the correct answer to fill in the paragraph are:
1.- πr²
2.- πr²h
3.- 1/3