Answer:
-13
Step-by-step explanation:
-42-7d=49
-7d=49+42
-7d=91
-d=13
d=-13
The answer is -a^2 + 3a +1
Let me know if it's right, this is what I got when I did the problem :)
4000/(4+96)=40
4000=4*25*40