Answer:
or 
Step-by-step explanation:
we have

step 1
Group terms that contain the same variable

step 2
Combine like terms

step 3
Eliminate parenthesis

step 4
Factor the number 

Answer:

Step-by-step explanation:
Given

--- vertically stretch
Required
The new function
The rule for vertical stretch is:

So, we have:


Answer:
8 : 6 = 24 : 18
Step-by-step explanation:
If there were 24 girls in class, there would be 18 boys.
Girls: 8, 16, 24
Boys: 6, 12 , 18
So, since averages are defined as:

So, since P are the total number of elements and P_k is the P_kth student. This is saying if we sum over each student's score and divide it by the number of students, we should get P, which is true.
So, using that logic, the other class can be represented as:

We can take both of these equations and multiply them by N:


So, if we want to find the average of this we should add both our equations then divide by P+N, which is the number of all the students.

To make this simpler we can replace our LHS with 86, since that's the average of both classes combined.

Simplified we would have P/N=3/8.
The coefficiant in the expression is the "c" next to the 2