I'm running low on points can you please help me :) Which expression is equivalent to 21 + 49?

7(3 + 49)
7(3 + 7)
7(14 + 42)
7(14 + 49)

What is the square root of 45? (step by step working plz)

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?

The base of a triangle is 8 1 3 meters and the height of the triangle is the fourth root of 16 meters meters. what is the area of the triangle?