What is the solution to the equation -6(3a + 4) = 3a - 3?

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?

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

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?