Which expression is equivalent to 6(2x - 4)?
A 8x - 10
B 8x - 4
C 12x - 24
D 12x - 4

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?