Answer:
So these two equation can be related by identity 
Step-by-step explanation:
We have given equation 
And 
We know the algebraic identity 
From this identity
can be written as (x+1) (x-1)
And using same identity
can be written as 
So these two equation can be related by identity 
The first thing we must do for this case is to define variables.
We have then:
x = Multiple-choice questions
y = short-answer questions
We write the following system of equations:
2x + 4y = 80
x + y = 25
Solving the system of equations we have:
x = 10
y = 15
Answer:
there are 10 multiple-choice questions
40: 2,2,2,5
10: 2,5
2 5
2*5=10
GCF is 10
Answer:
The ratio of how much they have watched to how much they have left to see is 4 : 1.
Step-by-step explanation:
Consider that the total duration of the film is, 1.
It is provided that James and Cameron paused when there is one-fifth left to watch.
That is, they have already watched,
th of the film.
Compute the ratio of how much they have watched to how much they have left to see as follows:

Thus, the ratio of how much they have watched to how much they have left to see is 4 : 1.
I think this is the answer.
1 =4
2=10
3=16