A.because -18 changes into positive and that would make it 18 + 12=30 and you divided it by -3x which should have x equal to -10
Answer:
The original price of the book was $12.50
Step-by-step explanation:
3x - 0.2(3x) + 10 = 40
30x - 2(3x) + 100 = 400
30x - 6x + 100 = 400
24x + 100 = 400
24x = 300
x = 12.50
https://www.mathpapa.com/algebra-calculator.html?q=x%3D10x%2F2%2B5
Step-by-step explanation:
Z+22/z = 12
z+22=12z
22=11z
2=z
Hope this helps. Just say if you need more of an explanation.
Answer:
If the answer helps you PLEASE mark me as brainliest
