Part 1. Collinear points are points that lay on the same line. In this case, the points A, B, and C, since they are on the same straight line, they are collinear.
Part 1 -- Correct.
Part 2. In this part, we need to find if it is correct that it takes about 11 and a half days for a million seconds to elapse.
First, since we know that each minute has 60 seconds and that 1 hour has 60 minutes, we can find the number of seconds per hour as follows:
[tex]60\times60=3,600[/tex]
We multiply this by the number of hours per day (24):
[tex]3,600\times24=86,400[/tex]
This is the number of seconds per day. Finally, multiply this result by 11.5 days:
[tex]86,400\times11.5=993,600[/tex]
This result is very close to 1,00,000. Thus, we conclude that is correct that in 11.5 days, about a million seconds will pass.
Part 2 -- Correct.
Part 3. Now we need to determine if the line AB is perpendicular to the line CD.
To be perpendicular lines, the angle between them must be 90°.
As we can see in the following image:
The angle between CD and AB is 90°, thus, the lines are perpendicular.
Part 3 -- Correct.
Part 4.
