Which statement explains the property of integer exponents shown in this equation?

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

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.