Answer:
x=4
Step-by-step explanation:
In a equilateral triangle, every angle has a measure of:

so:

X + 10 = -13
-13 - 10 = x
-23 = x
CHECK
-23 + 10 = -13
-13 = -13!
Answer: n< 3
Step-by-step explanation:
5n - 14 < 1 . add 14 to both sides
5n -14 +14 < 1 + 14
5n +0 < 15
5n < 15 divide both sides by 5 .5n/5 = 15/5
n < 3
3 fourths of an hour is : (3/4)
(3/4)*4=3 hours
hope this helps!