The surface area of a triangular pyramid is 305 square inches the area of the base is 35 square inches. each face has a base of 9 inches. what is the slant height?

Base Perimeter = sq rt (35) * 4 =  23.66 

Pyramid Surface Area = (½ * Perimeter of Base * Slant Height) + Base Area

305 = (.5 * 23.66 * slant height) + 35

270 = 11.83 * slant height

slant height = 270 / 11.83

slant height = 22.82

Double Check:
Pyramid Surface Area = (11.83 * 22.82) + 35
Pyramid Surface Area = 269.96 + 35
Pyramid Surface Area = 304.96
Okay!!!

1. 8 or -82. 14 or -143. -11, -3, 0, 7, 10