The upper comment is correct
Answer:
y = 90
Step-by-step explanation:
Since, e || f and a || b
Therefore, quadrilateral so formed is a rectangle.
Each angle of a rectangle is right angle.

Do the division :- 21 / 7 = 3
Answer is 3
Hello! I've noticed that this question hasn't been answered in a week, by now. If you still need the answers, here they are.
5) you need to use the Pythagorean theorem to get the answer. I got C) 5x + x<span>√17
6) Your answer choice would be C) 4</span><span>√6/ 3
Good luck. x</span>