Answer:
a = 20
Step-by-step explanation:
1/2a - 4 = 6
+4 +4
--------------------
1/2a = 10
*2 *2
---------------------
1a = 20
/1 /1
----------------------
a = 20<em> -------------------> answer</em>
1/2a = 10 (bring -4 to the other side)
a = 20 (times 2 by 10)
a = 20 is the answer
150
(2k+1)(k+3)
14k²+49k+21
simplify by dividing the whole equation by 7
2k²+7k+3
factorise
