Yesterday, nina's lunch cost $9.80 and she left a $1.47 tip. today, nina's lunch cost $12.60. if she tips the same rate that she did yesterday, how much tip should nina leave?

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

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?

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?