Pls explain... Do not give unreasonable/deconstructed answers/random letters, or a not-put-in-all-effort answer. I really need help on this.

Which value is not a solution of 8x^3 – 1 = 0

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

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