What formula would you use to find the area of this figure?

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

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?