What is a binomial? followed with an example?

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 equations is equivalent to x/3-6/x=1

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6