A circle has a diameter of 4.8 cm. Find, rounded to 2 decimal places, its area and perimeter

Plz i want answer and i would appreciate it is is a b c or d

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)