Answer:Alden is 13 years old
Step-by-step explanation
Let x represent Alden's age.
Let y represent the age of his sister.
Let z represent the age of his second sister.
His sister is 5 years older than he is and 3 times as old as his second sister. This means that
y = x + 5
y = 3z
Alden's brother is 4 years younger than his second sister. It means that his brother's age is
z - 4
His brother is 2. It means that
z - 4 = 2
z = 2 + 4 = 6
y = 3z
y = 3 × 6 = 18
Substituting y = 18 into y = x + 5, it becomes
18 = x + 5
x = 18 - 5 = 13
Answer: Multiplication
Step-by-step explanation:
Given
w/7=14
Multiply 7 on both sides
w/7 × 7=14 × 7
w=98
In order to isolate w on one side, we should times 7 as the numerator in order to eliminate the 7 in the denominator. To promise equality, we need to multiply 7 on both sides in order to isolate w and solve the equation.
<h2>Thus, it is multiplication.</h2>
Answer: 
Step-by-step explanation:
Equation of the line given ;
To find the slope of the line we will make y the subject of formula , that is
Therefore ; the slope = 
Two lines are said to be parallel if they have the same slope
This means that the slope of the second line =
Using the formula 
to find the equation of the line , we have
Answer:
E
Step-by-step explanation:
.03(50) + 0x = (50-x).05 How much 3% salt much be added to zero percent salt to create a mixture that is 5 percent salt.
3(50) = (50 - x)5 I multiplied through by 100 to clear the decimals
150 = 250 - 5x Distribute the 5
-100 = -5x Subtract 100 from both sides of the equation
20 = x divide both sides by -5
Answer:
252pi (B)
Step-by-step explanation:
Find the area of the bases (2 * pi * r^2)
r = 6, so:
72pi = total area of bases
Find the area of the side (pi * 2 * r * h)
r = 6 and 15 = h, so:
180 pi = area of the side
180pi + 72pi = 252pi (B)
