The ratio of red cars to blue cars in a parking lot was 7 : 2.if there were 35 red cars, how many blue cars were there?

Empty box + box + empty box fill in the box is equal to 30 how

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?

Me. i can't figure out this question. give an explanation too. .