Which of the following is the result of the equation below after completing the square in factoring

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *

Arectangle plot measure 20ft. by 30ft. a 3-ft.-wide sidewalk surrounds it.find the area of the sidewalk.

Find the value of x to the nearest tenth. a. 4.5 b. 5.4 c. 6.3 d. 7.2