That is a 30 60 90 triangle.
Read about those here: http://www.1728.org/trig2.htm
Answer:
13: Skew
14: Parallel
16: Intersecting
17: Skew
18: No
19: Yes
20: No
21: Yes
Step-by-step explanation:
Skew is when 2 lines dont intersect, nor are parallel (On different planes)
Parallel is when 2 lines are on the same plane, and will never touch
Intersecting is when any set of given points go through each other
X + y = 24
x - y = 2
Adding both equations
2x = 26
x = 13
y = 11
Y
y=ax
where a is a constant of proportionality;
y=20, x=4
20=4a
a=20/4
a=5
y=5x
The constant of variation is 5
25 minutes
I hope that helped
