How to multiply two mixed number fractions

The product of two negative rational numbers is always zero sometimes zero never zero

Multiply. write your answer in simplest form. 3/8 x 5/7

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.