3a + 2(4a - 1) = 9.
Distributive property.
3a + 8a - 2 = 9
Combine like terms.
11a - 2 = 9
subtract +2 on both sides.
11a - 2 = 9
+2 +2
__________________
11a = 11
/11 /11
a = 1.
Answer:

Step-by-step explanation:


Answer:
448 ft ^2
Step-by-step explanation:

Hope this helps,
If best, mark brainliest, if not, hope it helps anyway.
Answer:
:vvvvvvvvvvvvvvvvvvvvvvvv
Step-by-step explanation:
Answer:
2 times the square root of 21 all over 13
Step-by-step explanation: