Lamont surveyed his class on how they spent their free time during the week

2 is the number of hours using electronic devices :

1 hours playing sports

Also known as 2:1

Step-by-step explanation:

The first step is to simplify the ratio of hours using electronic devices to hours playing sports, which is 30 : 15

30 : 15

If I divide each number by 5 to simplify you get:

6 : 3

Then we divide each number by 2 to simplify:

2 : 1

That is how you get the answer for the ratio of 2:1.

I hope I helped and have a great day! ^-^

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.