Answer:
[22 x 21] / 2=231 or "c"
Step-by-step explanation:
4a+9=(-9+30-25). 4a+9=30-34. 4a+9=-4. 4a=-13. A=-3.25 :)
Answer: you just have to memorize it it will take time but its better doing it now than in 20 years
15a - 54 = -9. Add 54 to each side.
15a = 45. Divide each side by 15.
a = 3
