How do i find the answer to number 1

Georgia bought a packge of of 14 dollies to use in her valentines.she used 5/7 of the package to make her in valentines. how many dollies did she have left

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

Which speed is the fastest (use 1 mile ≈ 1.6 kilometers)? a. 12 miles/hour b. 18 feet/second c. 19 kilometers/hour d. cannot be determined