For 3 notebooks you pay $1.98 so the ratio is 1:0.66. For 10 notebooks, then we could scale the ratio and it will become 10:6.60. So they will cost you $6.60.
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
You could subtract 5/4 from each side of the equation. Then it would say x = -2/4 .
That's a perfectly true solution, but not a very attractive one. To pretty it up, you could simplify the fraction if you felt like it, and you would have x = -1/2 .
