30 points for 3 questions in one, math n listed in attached

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x