There were 450 students enrolled in a middle school at the beginning ​of the school year. ​The number of students enrolled in the school at ​the end of the year was 10 percent greater than the number of ​students enrolled in the school at the beginning of the year. How many ​students were enrolled in the school at the end of the year?

450*1.10 is 495

Step-by-step explanation:

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.