The radius of a sphere is 5 feet. find the area of the great circle of this sphere

In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.

Is a positive integer raised to a negative power always positive