Answer:
Step-by-step explanation:
(2x+4)° + 42° = 180°
x = 67°

Hope you could get an idea from here.
Doubt clarification - use comment section.
Answer:
1st quartile is 136
The second quartile is also the median 142
The third quartile is 162
The interquartile range is the difference between the 3rd and first quartile or 26
Step-by-step explanation:
Answer=18
First step combine the positive like terms
16+8+6
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|
\/
30
Second step is to combine negative like terms with 30
30-3-9
When you do this you add 9 and 3 together since they are similar to each other so it equals 12 there for the equation becomes.....
30-12
Final answer 18