Best method to solve quadratic equation x^2 +4x+3=0

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

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?

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?