Answer:
3a+5
Step-by-step explanation:
add-4a and 7a
3a+14-9
subtract 9 from 14
3a+5
38: it's a right triangle
39:
area:


circumference:

Answer: a = -4
Step-by-step explanation:
See https://web2.0calc.com/questions/help-please_82538.
Answer:15
Step-by-step explanation: